Chemistry - Mole Concept Question with Solution | TestHub

(A) Concentration of ${\mathrm{Al}}^{3+}=\frac{100\times 0.2}{1000\times 500}\times 1000=0.04\mathrm{M}$

Concentration of ${\mathrm{H}}^{+}=\frac{400\times 0.1}{1000\times 500}\times 1000=0.08\mathrm{M}$

Total cationic concentration $=0.04+0.08=0.12\mathrm{M}$

Concentration of ${\mathrm{Cl}}^{-}$ in ${\mathrm{AlCl}}_3=3\times 0.04\mathrm{M}=0.12\mathrm{M}$

Concentration of ${\mathrm{Cl}}^{-}$ in $\mathrm{HCl}=0.08\mathrm{M}$

Total ${\mathrm{Cl}}^{-}$ concentration $=0.12+0.08=0.20\mathrm{M}$

(B) $[{\mathrm{Cl}}^{-}]=\frac{50\times 0.4}{1000\times 100}\times 1000=0.2\mathrm{M}$

(C) $[{\mathrm{K}}^{+}]=\frac{2\times 30\times 0.2}{1000\times 100}\times 1000=0.12\mathrm{M}$

$[{\mathrm{SO}}_4{}^{2-}]=\frac{30\times 0.2}{1000\times 100}\times 1000=0.06\mathrm{M}$

(D) Weight of ${\mathrm{H}}_2{\mathrm{SO}}_4=24.5\times 2=49\mathrm{gm}$

$[{\mathrm{SO}}_4{}^{2-}]=\frac{48}{98\times 200}\times 1000=2.5\mathrm{M}$