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AP chemistry 2006 Form A Questions

by future_chemist
Tags: 2006, chemistry, form
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May14-07, 02:17 PM
P: 4
1. The problem statement, all variables and given/known data
I'm doing #5 in this Ap Chemistry 2006 Form A Free Response Questions. Here's the link

2. Relevant equations

3. The attempt at a solution

I think i got the first 3 parts right. Here's what i came up with.

a. X = Na2CO3
Y = KCl
Z = MgSO4

b. OH- + Mg+2 -> Mg(OH)2

c. X has a PH greater than 7 because the its solution contains OH-
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Answers look good except for 'c'. The answer is not false but is not the answer to the question asked. The presence of OH- must be backed up by more information, especially a reaction indicating where the OH- came from.
May16-07, 11:07 PM
P: 4
I got it figured out already. Thanks anyway. Please close this thread if you don't mind :)

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