5 litre of a solution contains 25 mg of `CaCO_(3)`. What is its concentration in ppm? (mol.wt of `CaCO_(3)` is 100)

Options

A. 25
B. 1
C. 5
D. 2500

Answer

C

Explanation

5L water ` = 5 xx 10^(3) g = 5 xx 10^(6)` mg
`5 xx 10^(6)` mg contains 25 mg `CaCO_(3)`
` therefore 10^(6)` mg water contains 5 mg `CaCO_(3)`
`therefore ` Concentration is 5 ppm.