Question

Concentration of $1$ mg per litre is equal to ___________ ppm.

Answer 1

Concentration of 1 mg per litre is equal to 1 ppm.
1 g corresponds to 1000 mg.
1 L corresponds to 1000 mL
ppm $=\frac{\text{mass of solute}}{\text{total mass of solution}}\times {10}^6=\frac{0.001}{1000}\times {10}^6=1$ppm