a-normal-and-clean-rainwater-has-been-found-to-have-a-ph-of-58-which-is-attribut

Question

A normal and clean rainwater has been found to have a pH of 5.8 which is attributed to the presence of carbonic acid formed from dissolved carbon dioxide gas in water. Calculate [H₂CO₃], [HCO₃⁻], and [CO₃²⁻], assuming that the total carbonate concentration is 1.0×10⁻⁵ M, and given that K_a1 and K_a2 values are 4.3×10⁻⁷ and 5.6×10⁻¹¹, respectively.

Accepted Answer

[H₂CO₃] = 7.9×10⁻⁶M

[HCO₃⁻] = 2.1×10⁻⁶M

[CO₃²⁻] = 7.5×10⁻¹¹M

Answer

[H₂CO₃] = 7.9×10⁻⁶M

[HCO₃⁻] = 2.1×10⁻⁶M

[CO₃²⁻] = 1.0×10⁻¹¹M

Answer

[H₂CO₃] = 8.9×10⁻⁶M

[HCO₃⁻] = 1.2×10⁻⁶M

[CO₃²⁻] = 7.5×10⁻¹¹M

Answer

[H₂CO₃] = 8.9×10⁻⁶M

[HCO₃⁻] = 1.1×10⁻⁷M

[CO₃²⁻] = 1.0×10⁻¹¹M

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