Question

# ln aqueous solution, the ionization constants for carbonic acid (H2CO3) are K1=4.2×10−7 and K2=4.8×10−11. Select the correct statement for a saturated 0.034 M solution of the carbonic acid.

A
The concentration of CO23 is 0.034 M.
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B
The concentration of CO23 is greater than that of HCO3.
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C
The concentration of H+ and HCO3 are approximately equal.
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D
The concentration of H+ is double that of CO23.
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Solution

## The correct option is D The concentration of H+ and HCO−3 are approximately equal.A→H2CO3⇌H++HCO−3, K1=4.2×10−7B→HCO−3⇌H++CO2−3, K2=4.8×10−11As K2<<K1, all major [H+]total≈[H+]Awhere,[H+]A=H+ ion concentration produce in first step.And from 1 equilibrium, [H+]A≈[HCO−3]≈[H+]total[CO−23] is negligible compared to [HCO−3] or [H+]total

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