Question

# The following reaction is known to occur in the body $$CO_{2} + H_{2}O \rightleftharpoons H_{2}CO_{3}\rightleftharpoons H^{+} + HCO_{3}^{-}$$. If $$CO_{2}$$ escapes from the system :

A
pH will decrease
B
hydrogen ion concentration will decrease
C
H2CO3 concentration will be unaltered
D
the forward reaction will be promoted

Solution

## The correct option is B hydrogen ion concentration will decreaseIf $$CO_2$$ escapes from the given system, then according to Le Chatelier's principle, the backward reaction will start and due to this backward reaction the concentration of $$H^+$$ ions will be decreased leading to increase in pH.Chemistry

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