Name: Azeotropic Mixtures
Uploaded: 2019-07-19
Duration: 8 min 23 s
Description: Certain liquid mixtures have a definite composition and boil at a constant temperature. They are called azeotropes. Let’s explore the cause of their behaviour!

Question

Complete the table by giving the value of van't Hoff's factor $i$ for complete dissociation of solute.

Salt	van't Hoff's factor $i$ for complete dissociation of solute.
$NaCl$
$Al {({NO}_{3})}_{3}$
$K_{2} {SO}_{4}$
${Al}_{2} {({SO}_{4})}_{3}$

Accepted Answer

The van't Hoff's factor $i$ expresses the extent of association or dissociation of solute in the solution.

For the dissociation reaction, the van't Hoff's factor $i = 1 + α (n - 1)$ .

All the given solutes undergo complete dissociation, therefore, $α = 1$ .

$n$ is the number of ions produced after the dissociation of one molecule of solute.

Thus, for (i) $NaCl \overset{}{\to} {Na}^{+} + {Cl}^{-}$ , the van't Hoff's factor $i = 1 + α (n - 1) = 1 + 1 \times (2 - 1) = 2$

(ii) $Al {({NO}_{3})}_{3} \overset{}{\to} {Al}^{3 +} + 3 {NO}_{3}^{-}$ , the van't Hoff's factor $i = 1 + α (n - 1) = 1 + 1 \times (4 - 1) = 4$

(iii) $K_{2} {SO}_{4} \overset{}{\to} 2 K^{+} + {SO}_{4}^{2 -}$ , the van't Hoff's factor $i = 1 + α (n - 1) = 1 + 1 \times (3 - 1) = 3$

(iv) ${Al}_{2} {({SO}_{4})}_{3} \overset{}{\to} 2 {Al}^{3 +} + 3 {SO}_{4}^{2 -}$ , the van't Hoff's factor $i = 1 + α (n - 1) = 1 + 1 \times (5 - 1) = 5$

Salt van't Hoff's factor $i$ for complete dissociation of solute.

$NaCl$ $2$

$Al {({NO}_{3})}_{3}$ $4$

$K_{2} {SO}_{4}$ $3$

${Al}_{2} {({SO}_{4})}_{3}$ $5$

Complete the table by giving the value of van't Hoff's factor $i$ for complete dissociation of solute.

Salt van't Hoff's factor $i$ for complete dissociation of solute.

$NaCl$

$Al {({NO}_{3})}_{3}$

$K_{2} {SO}_{4}$

${Al}_{2} {({SO}_{4})}_{3}$

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Azeotropic Mixtures

Ideal Solutions

Ideal and Non-ideal Solutions

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Complete the table by giving the value of van't Hoff's factor i for complete dissociation of solute. Salt van't Hoff's factor i for complete dissociation of solute. NaCl AlNO33 K2SO4 Al2SO43