How many milliliters of a 25% (m/v) NaOH solution would contain 75 g of NaOH?

2 Answers
Apr 26, 2016

3.0102mL

Explanation:

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A solution's mass by volume percent concentration, % m/v, essentially tells you how many grams of solute you get per 100 mL of solution.

∣ ∣ ∣¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯aa% m/v=mass of solute100 mL solution×100aa−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

In your case, a sodium hydroxide solution is said to have a 25% m/v concentration, which means that every 100 mL of this solution will contain 25 g of sodium hydroxide, NaOH.

Therefore, the volume of solution that will contain 75 g of sodium hydroxide will be

75g NaOH= 25% m/v100 mL solution25g NaOH=∣ ∣¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯aa3.0102mLaa−−−−−−−−−−−−

The answer is rounded to two sig figs.

Or

Jun 17, 2016

3.0102mL

Explanation:

A solution's mass by volume percent concentration, % m/v, tells you how many grams of solute you get per 100 mL of solution.

In your case, a 25% m/v solution of sodium hydroxide, NaOH, will contain 25 g of sodium hydroxide for every 100 mL of solution.

This means that you can use the solution's percent concentration as a conversion factor to help you determine how many milliliters would contain that many grams of sodium hydroxide.

75g NaOH= 25% m/v100 mL solution25g NaOH=∣ ∣¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯aa3.0102mLaa−−−−−−−−−−−−

The answer is rounded to two sig figs.