# AP Chemistry

posted by KorieBird

I'm having trouble getting the net ionic equation when HI is added to a buffered solution of HOBr. And the net ionic when HI is added to LiOBr.

From those results I'm supposed to compare why one pH drops more than the other.

1. DrBob222

I'm not certain I understand; however, if you have a buffered solution with HOBr/OBr^-, then,
OBr^- + H^+ ==> HOBr

I assume the second one is not buffered so you are adding a strong acid to the salt of a weak acid and it's the same net ionic equation as the first one.

If you posted the entire question we could help better.

2. KorieBird

Here is the whole question:
Two different 1.2 L buffered solutions were prepared using HOBr and LiOBr. Both buffered solutions had a pH of 5.2 at 25C. After 0.17 mols of HI were added to each of the solutions, it was found that the pH of one solution had dropped to 4.9 and the pH of the other had dropped to 3.1.
a. What is the balanced net ionic equation for the reaction that occurred when HI was added to these buffered solutions?
b. What trend must be true when comparing the concentrations of HOBr and OBr- in the two solutions is they shared the same pH before the HI was added?

Thank you!

3. DrBob222

I just don't understand the problem. I understand what is being asked; I don't understand the construction of the two "different" solutions.

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DrBob222 thank you for your previous response. I am reposting the entire question. Two different 1.2 L buffered solutions were prepared using HOBr and LiOBr. Both buffered solutions had a pH of 5.2 at 25C. After 0.17 mols of HI were …

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