# Chemistry

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okay so I have this question; Co3^2- is a component of soil and can neutralize acid deposition. Sketch the pH curve for soil containing carbonate ions that undergoes continual addition of hydronium ions from acid deposition. Include relevant chemical equations and information that explains the aspects of the pH curve.

So the equation @ starting point will be Co3^2- (aq) + H3O(aq) --> HCO3- (aq) + H2O (l)

what equation will be @ buffer region and on an end point??

and the graph will start from the bottom right? as in starting point will be down and end point on top?

• Chemistry -

#1. I'm going to let you in on a secret. Co is cobalt. I read the question twice before I figured out that Co3^2- was CO3^2-.
#2. We can't draw pictures and curves on the board.
#3. I found a curve that will do on the internet. Go here.
http://www.chemguide.co.uk/physical/acidbaseeqia/phcurves.html
Scroll down almost to the end of the page to the bold heading, "Adding HCl to Na2CO3." That will be the curve you want for CO3^-2.
The first equivalence point, marked A in the link, conforms to CO3^-2 + H^+ ==> HCO3^-. The second equivalence point, marked B in the link, conforms to
HCO3^- + H^+ ==> H2CO3.

The (H^+) at the first equivalence point (A) is (H^+) = √(k1k2)

That should be enough to gt you started.

• Chemistry -

thank u sooo much!! =)

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