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Problem #1: What is the percent by volume of a solution formed by making 25mL of isopropanol with 45ml water?
Problem 2: A photographic "atop bath" containg 160mL of pure acetas acid, HC2H01, in 650ml solution. Wher in the wly conceritration of acutic acid in the stop bath?
Problem #1: What is the percent by volume of a solution formed by making 25mL of isopropanol with 45ml water?
Problem 2: A photographic "atop bath" containg 160mL of pure acetas acid, HC2H01, in 650ml solution. Wher in the wly conceritration of acutic acid in the stop bath?
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Answer:
#1:
I assume that you mix the 25 mL alcohol with 45 mL water.
The answer depends on a big IF : IF the volumes are additive. Very often volumes of liquids are not additive
Total volume = 70 mL
isopropyl alcohol %(v/v) = 25mL/ 70 mL * 100 % = 35.7% v/v
The answer should have only 2 significant digits: 36%v/v