Q. Two solutions of substance (non-electrolyte) are mixed in the following manner. 480 mL of 1.5 M first solution +520 mL of 1.2 M second solution. What is the molarity of the final mixture ?
A) 2.70M
B) 1.344 M
C) 1.50 M
D) 1.20M
Explanation
(b)
Total molarity = $\frac{M_{1}V_{1} + \ M_{2}V_{2}}{V_{1} + \ V_{2}}$
= $\frac{1.5\ \times \ 480 + 1.2\ \times \ 520}{480 + 520}$
= 1.344 m
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.