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  • Which of the following electrolytes will have maximum coagulating value for \frac{Agl}{Ag^{+}} sol? (i) \; \text {Na}_{2}\text {S} (ii) \; \text {Na}_{3}\text {PO}_{4} (iii) \; \text {Na}_{2}\text {SO}_{4} (iv) \; \text {NaCl}

Which of the following electrolytes will have maximum coagulating value for {AgI}/{Ag^{+}} sol?

(i) \; \text {Na}_{2}\text {S}

(ii) \; \text {Na}_{3}\text {PO}_{4}

(iii) \; \text {Na}_{2}\text {SO}_{4}

(iv) \; \text {NaCl}

 

 

 

Answers (1)

The answer is the option (ii).

According to Hardy-Schulze law, the greater the charge on anion or the valency of coagulating ion, the greater will be its coagulating power.

Electrolytes Anionic part Charge on anion

\text {Na}_{2}\text {S}

 \text {S}^{2-} 2

\text {Na}_{3}\text {PO}_{4}

 \text {PO}_{4}^{3-} 3

\text {Na}_{2}\text {SO}_{4}

 \text {SO}_{4}^{2-} 2

\text {NaCl}

 \text {Cl}^{-} 1

Here, \text {PO}_{4}^{3-} have highest charge. Hence, \text {PO}_{4}^{3-} have highest coagulating power.

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