Iodine is sparingly soluble in water but much more so in carbon tetrachloride
is
Interpretation:
The fraction of iodine remaining in the aqueous solution under two conditions is to be calculated and their results are to be compared.
Concept introduction:
Equilibrium constant is the ratio of the concentration of reactants and products present in the chemical reaction.
For a general reaction:
The general formula for writing equilibrium expression for the reaction is given as:
Here,
A and B are reactants, C is products, and
The ratio between the number of moles of a substance and the total number of moles of a solution is called mole fraction.
Moles of a substance can be calculated by:
Concentration of a substance can be calculated as:
Answer to Problem 124AP
Solution:
Explanation of Solution
Given Information: The mass of iodine in the solution is
The volume of the solution is
The volume of the
The equilibrium constant of the reaction is
a) The fraction of
The fraction of iodine in the aqueous phase is given below.
The number of moles of iodine is calculated as follows:
The number of moles of iodine that dissolves in
The concentration of iodine in carbon tetrachloride and water is given as follows:
The concentration of iodine dissolved in tetrachloride and water is calculated by the expression as follows:
Substitute the values of
The fraction of iodine in the aqueous phase is,
Hence, the fraction of iodine that remains in the aqueous phase is
b) The fraction of
from the original solution that remains in the aqueous phase
The solution contains only
The fraction of iodine left in the next extraction with
Hence, the fraction remaining after the second extraction is
c) Compare the result in part (b) with a single extraction using
and comment on difference.
The single extraction of iodine with
The number of moles of iodine in
Substitute the values of
The fraction of iodine remaining in the aqueous phase is,
Hence, the fraction of iodine that remains in the aqueous phase is
The fraction of iodine that is dissolved in water is
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Chapter 15 Solutions
Chemistry
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