How many milliliters of a 25% (m/v) NaOH solution would contain 75 g of NaOH?
2 Answers
Explanation:
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A solution's mass by volume percent concentration,
∣∣ ∣ ∣∣¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯aa% m/v=mass of solute100 mL solution×100aa∣∣∣−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−
In your case, a sodium hydroxide solution is said to have a
Therefore, the volume of solution that will contain
75g NaOH⋅= 25% m/v100 mL solution25g NaOH=∣∣ ∣∣¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯aa3.0⋅102mLaa∣∣−−−−−−−−−−−−−−
The answer is rounded to two sig figs.
Or
Explanation:
A solution's mass by volume percent concentration,
In your case, a
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/v100 mL solution25g NaOH=∣∣ ∣∣¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯aa3.0⋅102mLaa∣∣−−−−−−−−−−−−−−
The answer is rounded to two sig figs.