A 42.12 % (w/v) solution of NaCl causes preci | vedclass

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

Question

(A) The coagulating value is defined as the minimum concentration of an electrolyte in $m\,mol \, L^{-1}$ required to cause coagulation of a sol in $2

Vedclass · Accepted Answer

$36 \, m\,mol \, L^{-1}$

Vedclass · Answer

(A) The coagulating value is defined as the minimum concentration of an electrolyte in $m\,mol \, L^{-1}$ required to cause coagulation of a sol in $2 \, hours$.$1$. Calculate the molar mass of $NaCl$: $M = 23.0 + 35.5 = 58.5 \, g \, mol^{-1}$.$2$. Calculate the molarity of the given $42.12 \% (w/v)$ solution:$42.12 \% (w/v)$ means $42.12 \, g$ of $NaCl$ in $100 \, mL$ of solution.Concentration in $g \, L^{-1} = 42.12 	imes 10 = 421.2 \, g \, L^{-1}$.Concentration in $mol \, L^{-1} = \frac{421.2}{58.5} = 7.2 \, mol \, L^{-1} = 7200 \, m\,mol \, L^{-1}$.$3$. The question asks for the coagulating value,which is the concentration required for coagulation. Given the data provided is insufficient to relate the time $(10 \, hours)$ to the standard definition $(2 \, hours)$ without a specific rate law or empirical relationship,the provided options suggest a calculation based on the concentration itself. However,based on standard textbook problems of this type,the answer is derived as $7200 \, m\,mol \, L^{-1}$. Since this is not an option,and the provided solution was 'Data insufficient',we maintain this assessment.

$A$ $42.12 \% (w/v)$ solution of $NaCl$ causes precipitation of a certain sol in $10 \, hours$. The coagulating value of $NaCl$ for the sol is $.....$
[Given : Molar mass : $Na = 23.0 \, g \, mol^{-1} ; Cl = 35.5 \, g \, mol^{-1}]$

Similar Questions

What is the difference between multimolecular and macromolecular colloids? Give one example of each. How are associated colloids different from these two types of colloids?

Why does bleeding stop by rubbing moist alum?

The most effective coagulating agent among the options for $Sb_2S_3$ sol is

The charge on colloidal particles can be determined by $......$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module

$A$ $42.12 \% (w/v)$ solution of $NaCl$ causes precipitation of a certain sol in $10 \, hours$. The coagulating value of $NaCl$ for the sol is $.....$[Given : Molar mass : $Na = 23.0 \, g \, mol^{-1} ; Cl = 35.5 \, g \, mol^{-1}]$