Molarity is number of moles of solute dissolved per litre of the solution while normality is number of gm-equivalent of solute dissolved per litre of solution. Molality is number of moles of solute dissolved per Kg of solvent. Normality and molarity change with change of temperature of solution but molality is independent of temperature. In case of monobasic acid normality and molarity are equal but dibasic acid or base molarity is two times of normality. In redox and neutralisation processes number of milliequivalentsof reactants as well as products are always equal. The volume of 0.1 M Ca(OH)_(2) required to neutralise 0.2 M H_(3)PO_(3) solution of volume 0.25 dm^(3) will be

Molarity is number of moles of solute dissolved per litre of the solut

1.	Molarity is number of moles of solute dissolved per litre of the solution while normality is number of gm-equivalent of solute dissolved per litre of solution. Molality is number of moles of solute dissolved per Kg of solvent. Normality and molarity change with change of temperature of solution but molality is independent of temperature. In case of monobasic acid normality and molarity are equal but dibasic acid or base molarity is two times of normality. In redox and neutralisation processes number of milliequivalentsof reactants as well as products are always equal. The volume of 0.1 M Ca(OH)_(2) required to neutralise 0.2 M H_(3)PO_(3) solution of volume 0.25 dm^(3) will be
Answer» 100mL 250 mL 500 mL 750 mL Solution :EQ. `Ca(OH)_(2)` = eq. `H_(3)PO_(3)` `Vxx0.1xx=0.2xx0.25xx2` `implies V=0.5L=500mL`