Question

4.9 gm of $H_{2}S{O}_4$ is mixed with water to form 5 litres of aqueous solution. Find its concentration.

(Molecular weight of $H_{2}S{O}_4$ is 98 gm/mole)

Answer 1

Given:

Weight = 4.9 g
Volume = 5 litres
Molecular weight of $H_{2}S{O}_4$ = 98 g/mole
Concentration = 1 mole of $H_{2}S{O}_4=98$ g/mole
Hence, 4.9 g = 4.9/98 = 0.05 mole
0.05 moles diluted to 5 litres.
Hence in 1 litre, 0.05/5 = 0.01 moles/litre
Thus, the concentration is 0.01 M.