Ionic EquilibriumHard

Question

Water in equilibrium with air contains 4.4 × 10−5% CO2. The resulting carbonic acid (H2CO3) gives the solution a hydronium ion concentration of 2.0 × 10−6 M about 20 times greater than that of pure water. What is the pH of the solution at 298 K? (log 4.4 = 0.64, log 2 = 0.3)

Options

A.5.36
B.5.70
C.8.30
D.5.64

Solution

PH = – log (2 × 10–6) = 5.70

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