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Solved: Write the Ka expression for each of the following
Chapter 18, Problem 7P(choose chapter or problem)
QUESTION:
Problem 7P
Write the Ka expression for each of the following in water:
(a) HNO2
(b) CH3COOH
(c) HBrO2
Questions & Answers
QUESTION:
Problem 7P
Write the Ka expression for each of the following in water:
(a) HNO2
(b) CH3COOH
(c) HBrO2
ANSWER:
Solution 7P
Here we have to write the Ka expression for each of the following in water:
Ka is the equilibrium constant . Let us consider the following example to write the expression for Ka.
HA (aq) + H2O (l) ⇆ H3O+ (aq) + A- (aq)
Ka can be written as,
Ka =
Here the concentration of [H2O] is omitted from the expression because it is treated as constant.
Step 1
(a) HNO2
Reaction of HNO2 with water (H2O):-
HNO2 (aq) + H2O (l) ⇆ H3O+ (aq) + NO2- (aq)
Thus the expression for Ka is, Ka = .