1 molal aqueous solution of an electrolyte A2B3 is 60% ionised. The boiling point of the solution at 1 atm is _________ K. (Rounded off to the nearest integer)
[Given Kb for (H2O) = 0.52 K kg mol$-$1]
Answer (integer)
375
Solution
${A_2}{B_3}\buildrel {} \over
\longrightarrow 2{A^{ + 3}} + 3{B^{ - 2}}$<br><br>No. of ions = 2 + 3 = 5<br><br>i = 1 + (n $-$ 1) $\alpha$<br><br>= 1 + (5 $-$ 1) $\times$ 0.6<br><br>= 1 + 4 $\times$ 0.6 = 1 + 2.4 = 3.4<br><br>$\Delta {T_b} = {K_b} \times m \times i = 0.52 \times 1 \times 3.4 = 1.768^\circ$ C<br><br>$\Delta {T_b} = {({T_b})_{solution}} - {[{({T_b})_{{H_2}O}}]_{Solution}}$<br><br>$1.768 = {({T_b})_{solution}} - 100$<br><br>${({T_b})_{solution}} = 101.768^\circ$ C<br><br>$= 375$ K
About this question
Subject: Chemistry · Chapter: States of Matter · Topic: Gas Laws
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