Question

$250ml$ of a calcium carbonate solution contains $2.5grams$ of $CaC{O}_3$. If $10ml$ of this solution is diluted to one litre, what is the concentration of the resultant solution ?

Answer 1

$250ml$ solution contain $2.5gmCaC{O}_3$

$10ml$ solution contain $\frac{2.5}{250}\times 10CaC{O}_3$

$=01gm$

number of mole of $CaC{O}_3=\frac{0.1}{100}=0.001$

Concentration $=\frac{0.001}{1litre}=0.001mol/litre$