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Sometimes concentration is expressed as a percent

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Ratio of mass of solute to mass of solution

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Percent by mass

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Example

You are making a solution with 25g of sucrose and 100 g of water.​

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What is your percent by mass? ​

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The total volume of our solution is :

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25 g of sucrose + 100 g of water

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= 125 g of solution

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Ratio of the volume of solute to the volume of solution​

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Percent by volume

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​Example

if we add 40 mL of ethanol to 200 mL of water, what is the percent by volume?

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