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Converting the molarities into moles but I'm having trouble with the reaction

by shaggyace
Tags: converting, molarities, moles, reaction, trouble
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shaggyace
#1
Mar7-12, 06:33 PM
P: 11
Can anyone help me with this problem?


Find the pH when 45.0 mL of 0.250 M NaOH(aq) is added to 35.0 mL of 0.200 M HCl(aq).

I started by converting the molarities into moles but I'm having trouble with what the reaction should look like. Shouldn't it produce a salt (NaCl) and water? And if so, how would I calculate the [H+] and then ph from that?
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aroc91
#2
Mar7-12, 08:47 PM
P: 161
Quote Quote by shaggyace View Post
Shouldn't it produce a salt (NaCl) and water?
Yes. If you've already converted to moles and you now know that the products are salt and water, you can now determine your limiting reagent and figure out how much H+ you have left over. With that and the total volume, you can determine the pH.
Borek
#3
Mar8-12, 01:48 AM
Admin
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P: 23,363
Alternatively, you may have to calculate pOH first, if there is OH- left.


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