{“smallUrl”:”https://www.wikihow.com/images/thumb/4/41/Calculate-the-Concentration-of-a-Solution-Step-1-Version-7.jpg/v4-460px-Calculate-the-Concentration-of-a-Solution-Step-1-Version-7.jpg”,”bigUrl”:”/images/thumb/4/41/Calculate-the-Concentration-of-a-Solution-Step-1-Version-7.jpg/aid790264-v4-728px-Calculate-the-Concentration-of-a-Solution-Step-1-Version-7.jpg”,”smallWidth”:460,”smallHeight”:345,”bigWidth”:728,”bigHeight”:546,”licensing”:”<div class=”mw-parser-output”><p>u00a9 2023 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not</b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>n</p><p><br />n</p></div>”}
1
Find the mass of the solute mixed in with the solvent. The solute is the substance that you’re mixing in to form your solution. If you’re given the mass of the solute in your problem, write it down and be sure to label it with the correct units. If you need to find the mass of the solute, then weigh it on a lab scale and record the measurement.[1] X Research source
If the solute you’re using is a liquid, then you can also calculate the mass using the density formula, where density D = m/V, where m is the mass of the liquid and V is the volume. To find the mass, multiply the density of the liquid by the volume.
Tip: If you need to use a scale, subtract the mass of the container you’re using to hold the solute or else your calculations will be off.
{“smallUrl”:”https://www.wikihow.com/images/thumb/5/58/Calculate-the-Concentration-of-a-Solution-Step-2-Version-6.jpg/v4-460px-Calculate-the-Concentration-of-a-Solution-Step-2-Version-6.jpg”,”bigUrl”:”/images/thumb/5/58/Calculate-the-Concentration-of-a-Solution-Step-2-Version-6.jpg/aid790264-v4-728px-Calculate-the-Concentration-of-a-Solution-Step-2-Version-6.jpg”,”smallWidth”:460,”smallHeight”:345,”bigWidth”:728,”bigHeight”:546,”licensing”:”<div class=”mw-parser-output”><p>u00a9 2023 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not</b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>n</p><p><br />n</p></div>”}
2
Record the total volume of the solution. The total volume of the solution is the amount of solvent plus the amount of solute added to it. If you’re finding the volume in a lab, mix the solution in a graduated cylinder or beaker and look at the measurement. Measure the volume from the curve at the top of the solution, or the meniscus, to get the most accurate reading. Record the volume of the solution.[2] X Research source
If you aren’t measuring the volume yourself, you may need to convert the mass of the solute into volume using the density formula.
For example, if you’re finding the concentration of 3.45 grams of salt in 2 liters of water, you would find the volume of salt using the density formula. Look up the density of salt either in a textbook or online and solve the formula for m. In this case, the density of salt is 2.16 g/mL. The formula would read 2.16 g/mL = (3.45 g)/V. Multiply each side by V to get V(2.16 g/mL) = 3.45 g. Then divide the each side by 2.16 to find the volume, or V = (3.45 g)/(2.16 g/mL) = 1.60 mL.
Add the volume of the solute to the volume of your solvent, ma. So in this example, 2 L + 1.6 mL = 2,000 mL + 1.6 mL = 2,001.6 mL. You can either leave the measurement in milliliters or convert it back to liters to get 2.002 L.
{“smallUrl”:”https://www.wikihow.com/images/thumb/6/6d/Calculate-the-Concentration-of-a-Solution-Step-3-Version-6.jpg/v4-460px-Calculate-the-Concentration-of-a-Solution-Step-3-Version-6.jpg”,”bigUrl”:”/images/thumb/6/6d/Calculate-the-Concentration-of-a-Solution-Step-3-Version-6.jpg/aid790264-v4-728px-Calculate-the-Concentration-of-a-Solution-Step-3-Version-6.jpg”,”smallWidth”:460,”smallHeight”:345,”bigWidth”:728,”bigHeight”:546,”licensing”:”<div class=”mw-parser-output”><p>u00a9 2023 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not</b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>n</p><p><br />n</p></div>”}
3
Divide the mass of the solute by the total volume of the solution. Write out the equation C = m/V, where m is the mass of the solute and V is the total volume of the solution. Plug in the values you found for the mass and volume, and divide them to find the concentration of your solution. Don’t forget to label to label your answer with the correct units.[3] X Research source
In our example for the concentration of 3.45 grams of salt in 2 liters of water, your equation would be C = (3.45 g)/(2.002 L) = 1.723 g/L.
Certain problems may ask for your concentration in specific units. Be sure to convert the units before putting them in your final formula.
Method 2
Method 2 of 3:
Finding Concentration in Percentage or Parts per Million
{“smallUrl”:”https://www.wikihow.com/images/thumb/e/e8/Calculate-the-Concentration-of-a-Solution-Step-4-Version-6.jpg/v4-460px-Calculate-the-Concentration-of-a-Solution-Step-4-Version-6.jpg”,”bigUrl”:”/images/thumb/e/e8/Calculate-the-Concentration-of-a-Solution-Step-4-Version-6.jpg/aid790264-v4-728px-Calculate-the-Concentration-of-a-Solution-Step-4-Version-6.jpg”,”smallWidth”:460,”smallHeight”:345,”bigWidth”:728,”bigHeight”:546,”licensing”:”<div class=”mw-parser-output”><p>u00a9 2023 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not</b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>n</p><p><br />n</p></div>”}
1
Find the mass of the solute in grams. Measure out the mass of the solute that you plan on mixing with your solution. Be sure to subtract the weight of the container you’re using to measure the solute or else your concentration will be inaccurate.[4] X Research source
If your solute is a liquid, you may need to calculate the mass using the formula D = m/V, where D is the liquid’s density, m is the mass, and V is the volume. Look up the density of the liquid in a textbook or online and then solve the equation for the mass.
{“smallUrl”:”https://www.wikihow.com/images/thumb/9/90/Calculate-the-Concentration-of-a-Solution-Step-5-Version-6.jpg/v4-460px-Calculate-the-Concentration-of-a-Solution-Step-5-Version-6.jpg”,”bigUrl”:”/images/thumb/9/90/Calculate-the-Concentration-of-a-Solution-Step-5-Version-6.jpg/aid790264-v4-728px-Calculate-the-Concentration-of-a-Solution-Step-5-Version-6.jpg”,”smallWidth”:460,”smallHeight”:345,”bigWidth”:728,”bigHeight”:546,”licensing”:”<div class=”mw-parser-output”><p>u00a9 2023 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not</b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>n</p><p><br />n</p></div>”}
2
Determine the total mass of the solution in grams. The total mass of the solution is the mass of the solvent plus the mass of the solute. Weight the masses using a lab scale or convert the volume of the solvent to mass by using the density formula D = m/V. Add the mass of the solute to the mass of the solvent to find your final volume.[5] X Research source
For example, if you want to find the concentration of 10 g of cocoa powder mixed with 1.2 L of water, you would find the mass of the water using the density formula. The density of water is 1,000 g/L, so your equation would read 1,000 g/L = m/(1.2 L). Multiply each side by 1.2 L to solve the mass in grams, so m = (1.2 L)(1,000 g/L) = 1,200 g. Add the mass of the cocoa powder to get 1,210 g.
{“smallUrl”:”https://www.wikihow.com/images/thumb/9/98/Calculate-the-Concentration-of-a-Solution-Step-6-Version-6.jpg/v4-460px-Calculate-the-Concentration-of-a-Solution-Step-6-Version-6.jpg”,”bigUrl”:”/images/thumb/9/98/Calculate-the-Concentration-of-a-Solution-Step-6-Version-6.jpg/aid790264-v4-728px-Calculate-the-Concentration-of-a-Solution-Step-6-Version-6.jpg”,”smallWidth”:460,”smallHeight”:345,”bigWidth”:728,”bigHeight”:546,”licensing”:”<div class=”mw-parser-output”><p>u00a9 2023 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not</b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>n</p><p><br />n</p></div>”}
3
Divide the mass of the solute by the total mass of the solution. Set up your equation so the concentration C = mass of the solute/total mass of the solution. Plug in your values and solve the equation to find the concentration of your solution.[6] X Research source
In our example, C = (10 g)/(1,210 g) = 0.00826.
{“smallUrl”:”https://www.wikihow.com/images/thumb/7/70/Calculate-the-Concentration-of-a-Solution-Step-7-Version-6.jpg/v4-460px-Calculate-the-Concentration-of-a-Solution-Step-7-Version-6.jpg”,”bigUrl”:”/images/thumb/7/70/Calculate-the-Concentration-of-a-Solution-Step-7-Version-6.jpg/aid790264-v4-728px-Calculate-the-Concentration-of-a-Solution-Step-7-Version-6.jpg”,”smallWidth”:460,”smallHeight”:345,”bigWidth”:728,”bigHeight”:546,”licensing”:”<div class=”mw-parser-output”><p>u00a9 2023 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not</b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>n</p><p><br />n</p></div>”}
4
Multiply your answer by 100 if you want to find the percent concentration. If you’re asked to list the concentration in a percentage, take the answer you just found and multiply it by 100. Label your final answer with a percentage sign.[7] X Research source
In this example, the percent concentration is (0.00826)(100) = 0.826%.
{“smallUrl”:”https://www.wikihow.com/images/thumb/2/29/Calculate-the-Concentration-of-a-Solution-Step-8-Version-6.jpg/v4-460px-Calculate-the-Concentration-of-a-Solution-Step-8-Version-6.jpg”,”bigUrl”:”/images/thumb/2/29/Calculate-the-Concentration-of-a-Solution-Step-8-Version-6.jpg/aid790264-v4-728px-Calculate-the-Concentration-of-a-Solution-Step-8-Version-6.jpg”,”smallWidth”:460,”smallHeight”:345,”bigWidth”:728,”bigHeight”:546,”licensing”:”<div class=”mw-parser-output”><p>u00a9 2023 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not</b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>n</p><p><br />n</p></div>”}
5
Multiply the concentration by 1,000,000 to find the parts per million. Use the number you found for your concentration and multiply it by 1,000,000 or 106. The number will be how many parts per million the solute is. Label your final answer in ppm.[8] X Research source
In our example, the ppm = (0.00826)(1,000,000) = 8,260 ppm.
Tip: Parts per million is usually used for very small concentrations since it’s easier to write and understand than a percentage.
Method 3
Method 3 of 3:
Calculating Molarity
{“smallUrl”:”https://www.wikihow.com/images/thumb/e/e7/Calculate-the-Concentration-of-a-Solution-Step-9-Version-5.jpg/v4-460px-Calculate-the-Concentration-of-a-Solution-Step-9-Version-5.jpg”,”bigUrl”:”/images/thumb/e/e7/Calculate-the-Concentration-of-a-Solution-Step-9-Version-5.jpg/aid790264-v4-728px-Calculate-the-Concentration-of-a-Solution-Step-9-Version-5.jpg”,”smallWidth”:460,”smallHeight”:345,”bigWidth”:728,”bigHeight”:546,”licensing”:”<div class=”mw-parser-output”><p>u00a9 2023 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not</b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>n</p><p><br />n</p></div>”}
1
Add the atomic masses of the solute together to find the molar mass. Look at the elements in the chemical formula for the solute you’re using. List the atomic mass for each element in the solute since atomic and molar mass are the same. Add together the atomic masses from your solute to find the total molar mass. Label the final measurement in g/mol.[9] X Research source
For example, if your solute is potassium hydroxide (KOH), find the atomic masses for potassium, oxygen, and hydrogen and add them together. In this case molar mass = 39 +16 + 1 = 56 g/mol.
Molarity is used mainly in chemistry when you know the chemical makeup of the solute you’re using.
{“smallUrl”:”https://www.wikihow.com/images/thumb/7/7e/Calculate-the-Concentration-of-a-Solution-Step-10-Version-5.jpg/v4-460px-Calculate-the-Concentration-of-a-Solution-Step-10-Version-5.jpg”,”bigUrl”:”/images/thumb/7/7e/Calculate-the-Concentration-of-a-Solution-Step-10-Version-5.jpg/aid790264-v4-728px-Calculate-the-Concentration-of-a-Solution-Step-10-Version-5.jpg”,”smallWidth”:460,”smallHeight”:345,”bigWidth”:728,”bigHeight”:546,”licensing”:”<div class=”mw-parser-output”><p>u00a9 2023 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not</b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>n</p><p><br />n</p></div>”}
2
Divide the mass of the solute by the molar mass to find the number of moles. Find the mass of the solute you’re adding into your solution using a lab scale if you need to.[10] X
Expert Source
Chris Hasegawa, PhD Retired Science Professor & Dean
Expert Interview. 29 July 2021.
Be sure to subtract the mass of the container so you have an accurate reading. Divide the mass you found by the molar mass so you can find how many moles of the solute you’re using. Label your answer with “mol.”[11] X Research source
For example, if you want to find the number of moles in 25 g of potassium hydroxide (KOH), then the equation is mol = (25 g)/(56 g/mol) = 0.45 mol
Convert the mass of your solute to grams if it isn’t already listed in grams.
Moles are used to represent the number of atoms in the solution.
{“smallUrl”:”https://www.wikihow.com/images/thumb/a/aa/Calculate-the-Concentration-of-a-Solution-Step-11-Version-4.jpg/v4-460px-Calculate-the-Concentration-of-a-Solution-Step-11-Version-4.jpg”,”bigUrl”:”/images/thumb/a/aa/Calculate-the-Concentration-of-a-Solution-Step-11-Version-4.jpg/aid790264-v4-728px-Calculate-the-Concentration-of-a-Solution-Step-11-Version-4.jpg”,”smallWidth”:460,”smallHeight”:345,”bigWidth”:728,”bigHeight”:546,”licensing”:”<div class=”mw-parser-output”><p>u00a9 2023 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not</b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>n</p><p><br />n</p></div>”}
3
Convert the volume of the solution to liters. Find the volume of the solvent before you mix in the solute.[12] X
Expert Source
Chris Hasegawa, PhD Retired Science Professor & Dean
Expert Interview. 29 July 2021.
Use a flask or a graduated cylinder to find the measurement if you aren’t given it. If your measurement is in milliliters, then divide it by 1,000 to convert it to liters.[13] X Research source
In this example, if you’re using 400 mL of water, then divide it by 1,000 to convert it to liters, which is 0.4 L.
If your solvent is already listed in liters, then you can skip this step.
Tip: You don’t need to include the volume of the solute since it doesn’t usually affect the volume that much. If there is a visible change in volume when you mix the solute with the solvent, then use the total volume instead.
{“smallUrl”:”https://www.wikihow.com/images/thumb/c/ca/Calculate-the-Concentration-of-a-Solution-Step-12-Version-4.jpg/v4-460px-Calculate-the-Concentration-of-a-Solution-Step-12-Version-4.jpg”,”bigUrl”:”/images/thumb/c/ca/Calculate-the-Concentration-of-a-Solution-Step-12-Version-4.jpg/aid790264-v4-728px-Calculate-the-Concentration-of-a-Solution-Step-12-Version-4.jpg”,”smallWidth”:460,”smallHeight”:345,”bigWidth”:728,”bigHeight”:546,”licensing”:”<div class=”mw-parser-output”><p>u00a9 2023 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is <b>not</b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.<br>n</p><p><br />n</p></div>”}
4
Divide the moles of solute by the volume of the solution in liters. Set up your equation so the molarity M = mol/V, where mol is the number of moles of the solute and V is the volume of the solvent. Solve the equation and label the answer M.[14] X Research source
Chris Hasegawa, PhD Retired Science Professor & Dean
Expert Interview. 29 July 2021.
In this example, M = (0.45 mol)/(0.4 L) = 1.125 M.
Tips
If you are in a lab and don’t know how much of a solute was added, you can perform a titration test using other reactive chemicals. You do need to learn how to balance chemical equations with stoichiometry.
