Question

Calculate the mass of anhydrous $N{a}_{2}C{O}_3$ required to prepare $250$ $ml$ of $0.25$ $M$ solution.

• A. $6.225$ $g$
• B. $66.25$ $g$
• C. $6.0$ $g$
• D. $6.625$ $g$

Answer 1

Answer: (D)

Molarity of solution is given by $M=\frac{w}{m\times V(l)}$ ;

Hence, $0.25=\frac{w}{106\times 0.25}$ ; $w=6.625$ $g$