Question

A 10% (v/v) methanol solution can be made by adding _________ of methanol to _________ of water, while a 10% (m/m) methanol solution can be made by adding _________ of methanol _________ of water.a. 10 mLb. 90 mLc. 90 gd. 100 ge. 100 mLf. 10 g

Answer 1

Answer:

A 10% (v/v) methanol solution can be made by adding 10 mL of methanol to 100 mL of water, while a 10% (m/m) methanol solution can be made by adding 10 g of methanol to 90 g of water

Explanation:

This percents are a sort of concentrations:

v/v means volume of solute in 100 mL of solution

m/m means mass of solute in 100 g of solution

Certainly in solutions that can be made by two liquids, we don't consider additive, the volumes.

In m/m, as the percent are the grams of solute in 100 g of solution, we consider the mass of water (generally the solvent) as 100 g - x % of solute

Mass of solution = Mass of solvent + Mass of solute