Question

The following data is obtained for coagulating a positively charged sol in 2 hours:

What is the coagulating value of electrolyte for this sol?

• A. \( 7 \times 10^{-5} \)
• B. \( 7 \times 10^{-2} \)
• C. \( 5 \times 10^{-2} \)
• D. \( 9 \times 10^{-2} \)

Hint:

To determine the coagulating value of an electrolyte, observe the concentration at which precipitation starts to occur.

Answer 1

The Correct Option is B

The coagulating value of electrolyte is the concentration of the electrolyte which causes precipitation of sol. From the given data, the sol starts precipitating at a concentration of \( 7 \times 10^{-5} \) mol L\(^{-1}\). Hence, the coagulating value of the electrolyte is \( 7 \times 10^{-5} \).