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Old 05-04-2008, 05:21 PM   #1
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this isnt sat but you guys are smart
what is the pH of a 10^-4 HCl solution
a4
b6
c8
d10




also which indicator is used to study neitralizations of strong acids with weak bases
a phenolphthaelin
b methyl orange
c bromthymol blue
d none of the above


i have a alot more but i dont want to type them all and them not get answered
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Old 05-04-2008, 05:23 PM   #2
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pH is A. 4

-log(10^-4)

Second one I am not sure.
Maybe it's D. and should be Litmus paper? I dunno.
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Old 05-04-2008, 05:29 PM   #3
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It's a for the second one.
I'm pretty sure of it.
And you spelt it wrong. It's phenolphthalein. Not phenolphtlaelin.
Also it's neutralizations...
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Old 05-04-2008, 07:27 PM   #4
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It's either methyl orange or bromothymol blue.

Wrong forum, btw. You should try the High School Life forum . . . there should be lots of chemistry nerds there.
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Old 05-04-2008, 07:29 PM   #5
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^ It's not phenolphthalein? =O
My teacher lied to me.
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Old 05-04-2008, 07:37 PM   #6
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I just looked it up, methyl orange looks like the answer.

"Chemists use methyl orange as an indicator in the titration of weak bases with strong acids. It changes from red (at pH 3.1) to orange-yellow (at pH 4.4)"
General Chemistry Online: FAQ: Acids and bases: What is methyl orange? How is it made?

"For strong acids and weak bases methyl orange is the indicator of choice."
IB Chemistry higher level notes: Indicators
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