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Weak acids?
#1
This is really more of a conceptual question than anything.
(I realize how sad/odd it is that I'm asking conceptual questions about chemistry on a Maplestory fansite. Oh well.)

Now, here's a problem from my homework.

Quote:What volume of each of the following acids will react completely with 50.00mL of 0.200M NaOH?
a. 0.100M HCl
b. 0.150M HNO[SIZE="1"]3[/SIZE]
c. 0.200M HC[SIZE="1"]2[/SIZE]H[SIZE="1"]3[/SIZE]O[SIZE="1"]2[/SIZE]

I get how to do it and all, find the # of moles of OH- in the sodium hydroxide, set that equal to the # of moles of H+, and find how much volume of acid that equates to. Yada yada.

My question is this. According to the answer I get, it takes twice as much NaOH to neutralize the HC[SIZE="1"]2[/SIZE]H[SIZE="1"]3[/SIZE]O[SIZE="1"]2[/SIZE] than the HCl. Suppose the molar concentrations were the same, then it would take the same amount of NaOH for both.

However, acetic acid is a weak acid, so (I thought) it should require less base to neutralize it than for a strong acid like HCl. But that's not what the problem answer says.

So am I wrong, and weak acids and strong acids are actually equally capable of neutralizing a strong base (per mole), or is it something else I don't understand?
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Messages In This Thread
Weak acids? - by Russt - 2009-09-08, 09:19 PM
Weak acids? - by Dusk - 2009-09-08, 09:37 PM
Weak acids? - by JoeTang - 2009-09-08, 11:31 PM
Weak acids? - by Moonlapse - 2009-09-08, 11:46 PM
Weak acids? - by WetFish - 2009-09-27, 06:45 PM

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