Question

If 45 mL of water is added to 250 mL of a 0.75 M $K_{2}S{O}_4$ solution, what will be the molarity of the diluted solution?

• A. 0.75 M
• B. 0.85 M
• C. 0.64 M
• D. 0.50 M

Answer 1

The correct option is C 0.64 M

$M_1{V}_1=M_2{V}_{2}0.75\times 250=M_2\times 295M_2=\frac{\left(0.75M\right)\left(250mL\right)}{\left(295mL\right)}=0.636M\sim 0.64M$