A volume of 250 ml of a 0.05 M solution of a reagent of formula weight 40 was made up, using weighing by difference. The standard deviation oh each weighing was 0.0001 g:what were the standard deviation and relative standard deviation of the weight of reagent used? The standard deviation of volume of solvent used was 0.05 ml. Express this as a relative standard deviation. Hence calculate the relative standard deviation of the molarity of the solution.
Repeat the calculation for a reagent of formula weight 392.