1. What is the percent by volume of ethanol when 85 mL is diluted to a volume
of 250 mL water?
2. What is the percent by volume of a solution formed by added 50 mL of
acetone to 100 mL of water?
Share
1. What is the percent by volume of ethanol when 85 mL is diluted to a volume
of 250 mL water?
2. What is the percent by volume of a solution formed by added 50 mL of
acetone to 100 mL of water?
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Answer:
1.If 60 ml of ethanol is diluted to a final volume of 400 ml, you create a 35 % ethanol solution.
First, realize that you creating a solution with that contains a polar solute (ethanol) with a polar solvent (water). Remember that "like dissolves like."
If you pour 60 ml of ethanol in a volumetric flask, you add 340 ml of water to dilute this solution to a final volume of 400 ml.
Volumetric flasks are designed to make or dilute solutions to specified final volume.
Since you have 60 ml of ethanol in a total solution of 400 ml, the percentage of ethanol is 35 %.
This result is obtained in the following manner.
ml/400. ml. = .35
.35 x 100% = 35 %
2.to solve volume/volume% use this formula
v/v % = [(volume of solute in L)/(volume of solution in L)] x 100%
but convert ml to L first by dividing the values in ml by 1000
so 15/1000=0.015 and 28/1000=0.028 then you can now do the substitution
v/v%= (0.015/0.028) X 100 = 53.57% or you can round this off to 54%