Solutions Question 388

Question: The partial pressure of CO2 in air saturated with water vapours at 25C and 1.00 atm is 3.04×104 atm. Henry’s constant for CO2 in water is 2.3×102,mol,L1atm1 and for carbonic acid pKa is 6.37. The pH of normal ( CO2 mixed) rain water will be

Options:

A) 7.42

B) 6.37

C) 6.99

D) 5.76

Show Answer

Answer:

Correct Answer: D

Solution:

Solubility =K,pCO2

=2.3×102×3.04×104

=6.992×106mol,L1

H2CO3H++HCO3[H+]=Ka.,S

pH=12[pKalogS]

=12[6.37log6.992×106]

=12[6.37+5.16],pH=5.76



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