Solution Found!
Write the Ka expression for each of the following in
Chapter 18, Problem 8P(choose chapter or problem)
QUESTION:
Problem 8P
Write the Ka expression for each of the following in water:
(a)H2PO4-
(b) H3PO2
(c) HSO4-
Questions & Answers
QUESTION:
Problem 8P
Write the Ka expression for each of the following in water:
(a)H2PO4-
(b) H3PO2
(c) HSO4-
ANSWER:
Solution 8P
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)H2PO4-
Reaction of H2PO4- with water (H2O):-
H2PO4- (aq) + H2O (l) ⇆ H3O+ (aq) + HPO42- (aq)
Thus the expression for Ka is, Ka = .