Question

A student prepares a solution by pipetting 15.0 ml of 0.50 M solution of trisodium phosphate (Na2PO4) into a 250 ml volumetric flask, adding deionized water precisely to the mark on the flask and mixing well. Calculate the molarity of Na2PO4 solution.

Answer 1

To calculate the molarity of the solution we take the formula

$M_2 = (M_1×V_1) ÷ V_2\newline M_2= (0.50×15.0ml) ÷250ml\newline M_2= 0.03M$