Assuming the compounds to be completely dissociated in aqueous solution, identify the pair of the solutions that can be expected to is isotonic at the same temperature.

Assuming the compounds to be completely dissociated in aqueous solutio

1.	Assuming the compounds to be completely dissociated in aqueous solution, identify the pair of the solutions that can be expected to is isotonic at the same temperature.
Answer» 0.01 M Urea and 0.01 M NaCl 0.02 M NaCl and 0.01 M `Na_2SO_4` `0.03 M NaCl and 0.02 M MgCl_2` 0.01 M Sucrose and 0.02 M glucose. Solution :For isotonic solutions , `pi_1 = pi_2` where, `pi=` OSMOTIC pressure = iCRT As the given solutions are at same TEMPERATURE thus, `i_(1)C_(1)RT = i_(2)C_(2)RT` (a) For urea , `i_1 =1,C_1 = 0.01 M` For `NaCl , i_(2) , C_(2) =0.01 M` `1 xx 0.01 xx RT ne 2 xx 0.01 xx RT` (not isotonic) (b) For `NaCl : i_(1) = 2, C_1 =0.02 M` for `Na_(2)SO_(4) , i_(2) =3, C_(2) =0.01 M ` `2 xx 0.02 xx RT ne 3 xx 0.01 xx RT` (not isotonic) (c) For NaCl ,`i_(1) =2 , C_(1) = 0.03 M ` For Mg`Cl_(2): i_(2) = 3 ,C_(2) = 0.02 M` `2 xx 0.03 xx RT = 3 xx 0.02 xx RT` 0.06 RT = 0.06 RT Thus , these solutions are isotonic.