Q. 5 L of a solution contains 25 mg of $Ca{CO}_{3}.$ What is its concentration in ppm? (mol. wt. of $Ca{CO}_{3}\$is 100)
A) 25
B) 1
C) 5
D) 2500
Explanation
(c)
ppm =$\frac{weight\ of\ solute\ \times 10^{6}}{weight\ of\ solution\ }$
= $\frac{25 \times 10^{- 3} \times 10^{6}}{5000}$ = 5
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.