[Vukery]

Carbon dioxide (CO2) is readily soluble in water, according to the equation CO2 + H2 --> H2CO3.
Carbonic acid (H2CO3) is a weak acid. If CO2 is bubbled into a beaker containing pure, freshly-distilled water, how would be the graph that correctly describes the results?
the variables of the graph are: pH in the y- axis and time in the x-axis
pH goes from 1 to 14 and all the graphs start at 7, as water is neutral. The problem there is what happens with the pH?

you can say that it is constant, decreasing, increasing, or any suggest, please answer quickly..
Thanks by the way!

[rabolisk]

CO₂ is somewhat soluble in water. Most gases are only sparingly soluble in water, but CO more so because of the equilibrium between it and carbonic acid.
CO₂(g)  CO₂(aq)
CO₂(aq) + H₂O(l)  H₂CO₃(aq)

Carbonic acid is partially deprotonated at equilibrium.
H₂CO₃(aq)  HCO₃^-(aq) + H⁺(aq)

So the overall equilibrium is really
CO₂(g)  CO₂(aq)  H₂CO₃(aq)  HCO₃^-(aq) + H⁺(aq)

I neglected water. Now think Le Chatelier's principle, and the definition of pH.