1. If make a solution by adding water to 75mL of ethanol until the total volume of the solution is 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 3% (v/v). How many mL of agua oxigenada are in a 400ml bottle of this 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 3% (v/v). How many mL of agua oxigenada are in a 400ml bottle of this solution?
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Answer:
1. Well, assuming that the the water and ethanol don’t interact in such a way that the sum of the volumes is not less the than the individual volumes. Then, 300 mL of water will be added. The percent volume of ethanol, then, will be
%Volume of Ethanol will be = 75/375 * 100 = 20%
2. This is an aqueous solution in which liquid isopropyl alcohol is the solvent since its concentration is greater than 50%. The volume of the solvent...
3. this is a dimensional analysis problem. To do it, you write the units or dimensions of each substance with correct details. So you are given 3% (v/v). That means 3 mL H2O2 in 100 mL solution. You want to find mL H2O2 in 400 mL solution.
So: X mL solution = [3 mL H2O2/100 mL solution] x 400 mL solution
Explanation:
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