Which of the methods described below will yield 500 mL of a 0.100 M KMnO₄ solution?

Question

Quizplus · Accepted Answer

The most accurate way to make a solution of a specific concentration is to dissolve a known mass of the solute and dilute it to the desired volume. Option C describes this method, where 7.90 g of KMnO4 is dissolved in water and diluted to exactly 500 mL. Option A involves adding exactly 500 mL of water to a known mass of KMnO4, but it does not specify the mass needed to make a 0.1 M solution, so it is not the best choice. Option B simply states to add 500 mL of water to KMnO4, which is not enough information to make a specific concentration. Option D involves using twice the necessary mass of KMnO4 to make the solution, resulting in a concentration of 0.2 M. Option E involves diluting a solution of higher concentration, but it requires specific calculations to ensure that the final concentration is 0.1 M, so it is not the best choice.

Which of the Methods Described Below Will Yield 500 ML