ADDITIONAL READINGS: There are several ways to express the amount of solute present in a solution. The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution. > A concentrated solution is one that has a relatively large amount of dissolved solute. > A dilute solution is one that has a relatively small amount of dissolved solute. Percent Concentration Mass Percent When the solute in a solution is a solid, a convenient way to express the concentration is a mass percent (mass/mass), which is the grams of solute per 100g of solution. Mass of Solute Percent by Mass= x100 Mass of Solution Volume Percent The percentage of solute in a solution can more easily be determined by volume when the solute and solvent are both liquids. The volume of the solute divided by the volume of the solution expressed as a percent, yields the percent by volume (volume/volume) of the solution. Volume of Solute Percent by Volume= x100 Volume of Solution Mass-Volume Percent Another version of a percentage concentration is mass/volume percent, which measures the mass or weight of solute in grams (e.g., in grams) vs. the volume of solution (e.g., in mL). Mass of Solute (g) Volume of Solution (mL) Mass/Volume Percent = -X 100

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter11: Solutions

Section: Chapter Questions

Problem 65AP

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Question

Learning Task No. 4:
Use the sample problem as a guide to help you solve the % concentration of your prepared solution.

Dissolve 10.0g of a substance in 100.0g of water., the concentration by mass will be:

Divide the mass of the solute by the total mass of the solution.

c%=10.0g10.0g+100.0g* 100%=9.09

Solutions to make:
1. 450 g flour and 1 L water

2. 500 ml alcohol and 1 L water

3. 300 g rice grains and 540 ml water

4. 450 g sugar and 360 ml coconut milk

5. 50 ml liquid detergent and 250 ml water