use gresa method
Rubbing alcohol is sold as a 70% (v/v) solution of isopropyl alcohol in water. What volume of isopropyl alcohol is used to make 500mL of rubbing alcohol?
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use gresa method
Rubbing alcohol is sold as a 70% (v/v) solution of isopropyl alcohol in water. What volume of isopropyl alcohol is used to make 500mL of rubbing alcohol?
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Answer:
350 M L is the answer
Explanation:
Using this equation,
Volume/volume percent = x 100 %
Rearrange to solve for volume of solute:
Volume of solute =
=volume of solute Volume of solution Volume/volume % x volume of solution 100%
70% x 500 m L
100%
= 350 m L
350 m L of isopropyl alcohol is used to make 500 m L of 70% (v/v) rubbing alcohol.