Prepare 50 mL of an aqueous 0.50% (v/v) NaHCO3 solution.

Question

Set up the calculation for how much you need for the solution.

Answer 1

0.50% w/v means you want 0.50 grams of NaHCO₃ in 100 mls of solution.

Since you only want to make 50 mls (not 100 mls), you need 1/2 of 0.50 g or 0.25 g.

Done by dimensional analysis (more typical way to do it), you have the following set up:

50 ml x 0.50 g / 100 ml = 0.25 g NaHCO₃