1. If I make a solution by adding water to 75mL of ethanol until the total
volume of the solution W 375ml, what is the percent by volume of ethanol in
the solution?
2. 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?
3. A bottle of hydrogen peroxide also known as agua oxigenada is labeled 39%
(v/M. How many mL of agua oxigenada are in a 400ml bottle of this solution?
Answers
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The answers are as follows:
1. The solution's net volume is 375ml. In this ethanol is 75ml.
The percent by volume of ethanol =
The volume of ethanol / Volume of solution X 100
= 7500 / 375 = 20%
Hence, the percent by volume of ethanol in the solution is 20%.
2. Given that rubbing alcohol is 70% (v/v)
⇒ 70 ml isopropyl alcohol is present in a 100 ml alcohol solution.
In 500 ml of rubbing alcohol, using unitary method the volume of isopropyl alcohol = 70 X 500 / 100 = 70 X 5 = 350ml.
Hence, 350ml of isopropyl alcohol is used to make 500mL of rubbing alcohol.
3. Agua Oxigenada is 39% (v/v).
⇒ 39ml Hydrogen Peroxide is present in 100 ml of the solution.
In 400 ml of solution, using unitary method the volume of Agua Oxigenada present = 39 X 400 / 100 = 39 X 4 = 156 ml.
Hence, 156 ml of Agua Oxigenada is present in a 400ml bottle of the solution.