The boiling point of 0.001 M aqueous solutio | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The elevation in boiling point is given by the formula $\Delta T_{b} = i 	imes K_{b} 	imes m$. Since $K_{b}$ and $m$ are constant for the given

Vedclass · Accepted Answer

$CH_{3}COOH < NaCl < Na_{2}SO_{4} < K_{3}PO_{4}$

Vedclass · Answer

(A) The elevation in boiling point is given by the formula $\Delta T_{b} = i 	imes K_{b} 	imes m$. Since $K_{b}$ and $m$ are constant for the given solutions,$\Delta T_{b} \propto i$ (van't Hoff factor).$CH_{3}COOH$ is a weak electrolyte and dissociates partially,so its $i$ value is approximately $1 $NaCl$ dissociates into $2$ ions $(Na^+, Cl^-)$,so $i \approx 2$.$Na_{2}SO_{4}$ dissociates into $3$ ions $(2Na^+, SO_{4}^{2-})$,so $i \approx 3$.$K_{3}PO_{4}$ dissociates into $4$ ions $(3K^+, PO_{4}^{3-})$,so $i \approx 4$.Therefore,the order of boiling points is $CH_{3}COOH < NaCl < Na_{2}SO_{4} < K_{3}PO_{4}$.

The boiling point of $0.001 \ M$ aqueous solutions of $NaCl$,$Na_{2}SO_{4}$,$K_{3}PO_{4}$ and $CH_{3}COOH$ should follow the order.

Similar Questions

We have three aqueous solutions of $NaCl$ labelled as $A$,$B$ and $C$ with concentrations $0.1 \ M$,$0.01 \ M$ and $0.001 \ M$,respectively. The value of van 't Hoff factor $(i)$ for these solutions will be in the order:

$17.4\% (W/V)$ of potassium sulphate $(mol. wt. = 174)$ is isotonic with $4\% (W/V)$ aqueous solution of $NaOH$. If $NaOH$ is $100\%$ ionised,the degree of ionisation of potassium sulphate is $.......... \%$.

Which of the following solutions has the lowest freezing point?

The freezing point of a solution prepared by adding $8.1 \ g$ of $HBr$ ($90\%$ ionized) to $100 \ g$ of water is $...... \ ^\circ C$. (Given $K_f$ for water $= 1.86 \ K \ kg \ mol^{-1}$)

$0.5 \text{ molal}$ aqueous solution of a weak acid $(HX)$ is $20\%$ ionised. If $K_f$ for water is $1.86 \ K \ kg \ mol^{-1}$,the depression in freezing point of the solution is $......... \ K$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module