How much sodium hydroxide will you weigh to prepare 0.25 L of 3 M solution?
How much sodium hydroxide will you weigh to prepare 0.25 L of 3 M solution?
Select an option to attempt
Correct Answer: Option A
Explanation
Mass of NaOH needed:. MW of NaOH: Na(23) + O(16) + H(1) = 40 g/mol. Procedure: Weigh 30 g NaOH, dissolve in ~200 mL water (NaOH dissolution is exothermic — cool before making up volume), then make up to 250 mL (0.25 L) in a volumetric flask. NaOH is hygroscopic, so it should be weighed quickly to avoid absorbing atmospheric moisture.