1. The problem statement, all variables and given/known data 2.8 g of NaCH3COO is dissolved into an unknown volume. The resulting concentration produced is 4.3 * 10-2 M, what volume of water was used? 2. Relevant equations c = n/V 3. The attempt at a solution I calculated molar mass of the NaCH3COO as 82.0 g/mol, which is 0.034 mol. I then used the c = n/V equation. 4.3 * 10-2 M = 0.034 mol / V V = 0.79 L Where I am confused now is if that is the volume of the solution, or of the water? I think it's the volume of solution, and am not sure how to calculate the water.