February 22, 2017

Homework Help: Analytical Chemistry

Posted by Sam on Friday, February 22, 2013 at 2:27pm.

Carbon dioxide dissolves in water to form carbonic acid, which is primarily dissolved CO2. Dissolved CO2 satisfies the equilibrium equation.

CO2(g) <----> CO2(aq)

The acid dissociation constants listed in most standard reference texts for carbonic acid actually apply to dissolved CO2. K=0.032 M/atm

For a CO2 partial pressure of 4.4×10-4 atm in the atmosphere, what is the pH of water in equilibrium with the atmosphere?

Note: Since carbonic acid is primarily dissolved CO2, the concentration of H2CO3 can be taken as equal to that of dissolved CO2.

My online homework is due tonight and I am hopelessly lost on how to solve this problem. :(

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