Answers

2015-10-26T22:45:54+08:00
Example,
A solution is prepared by dissolving 90 milliliters of pure hydrogen peroxide in enough water to make 3000 milliliters of solution.The concentration of the hydrogen peroxide solution is,

SOLUTION:
Given data:
Volume of solute= 90 mL
Volume of solution=3000 mL

Substitute the values in the corresponding formula,

Volume Percent = volume of solute/Volume of solution= x100 PERCENT.
Volume percent = 90 mL/3000 mL = x100 PERCENT.
Volume percent = 3 PERCENT.

Therefore,the concentration of the hydrogen peroxide solution is 3 PERCENT.

2ND,
Calculate the volume/volume percent solution formed by combining 25 milliliters of ethanol with enough water to make 200 milliliters of solution.

SOLUTION:

Given data:
Volume of solute = 25 mL
Volume of solution = 200 mL

Substitute,the values in the corresponding formula,

Volume percent = volume of solute/volume of solution = x100 PERCENT.
Volume percent = 25 mL/200 mL = x100 PERCENT.
Volume percent = 12.5 percent.

Therefore,the concentration of ethanol solution is 12.5 percent.

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