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Topic: pH question  (Read 11852 times)

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yangyangg

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pH question
« on: May 15, 2006, 08:56:45 AM »
I do not understand the following problem. Can anyone help me to solve it?


Which of the following solutions when mixed with 50mL of 1.0M hydrochloric acid would NOT result in a change in pH?

A. 50mL of 1.0M sodium chloride solution

B. 50mL of 1.0M ethanoic acid

C. 50mL of 1.0M nitric acid

D. 50mL of 1.0M sulphuric acid


Offline Albert

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Re: pH question
« Reply #1 on: May 15, 2006, 09:02:23 AM »
What do you think will happen to thenumber of protons, if you add another strong acid?
« Last Edit: May 15, 2006, 12:55:14 PM by Albert »

yangyangg

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Re: pH question
« Reply #2 on: May 15, 2006, 09:03:16 AM »
It increases??

Offline Albert

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Re: pH question
« Reply #3 on: May 15, 2006, 09:04:53 AM »
Yes, indeed. So, what about the pH?  ;)
« Last Edit: May 15, 2006, 12:55:32 PM by Albert »

yangyangg

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Re: pH question
« Reply #4 on: May 15, 2006, 09:05:50 AM »
the pH will drop??

Offline Albert

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Re: pH question
« Reply #5 on: May 15, 2006, 09:08:30 AM »
Yes! So, what's the correct answer? :D
« Last Edit: May 15, 2006, 12:55:51 PM by Albert »

yangyangg

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Re: pH question
« Reply #6 on: May 15, 2006, 09:10:34 AM »
Is it option A?

Offline Albert

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Re: pH question
« Reply #7 on: May 15, 2006, 09:14:26 AM »
Yes, it is. :)
« Last Edit: May 15, 2006, 12:56:08 PM by Albert »

yangyangg

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Re: pH question
« Reply #8 on: May 15, 2006, 09:16:24 AM »
Thanks!!

Offline Borek

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Re: pH question
« Reply #9 on: May 15, 2006, 09:18:12 AM »
Think it over - question is tricky!
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

Offline AWK

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Re: pH question
« Reply #10 on: May 15, 2006, 09:20:31 AM »
No! - pH do not change when you mix equal volumes of two strong monoprotic acids of the same concentration. - other option
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yangyangg

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Re: pH question
« Reply #11 on: May 15, 2006, 09:21:26 AM »
But how the pH will change if a neutral solution is added?

Offline AWK

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Re: pH question
« Reply #12 on: May 15, 2006, 09:23:12 AM »
But how the pH will change if a neutral solution is added?
Think about dilution of acid
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yangyangg

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Re: pH question
« Reply #13 on: May 15, 2006, 09:26:07 AM »
But ethanoic acid is not a strong acid, I think??

Offline AWK

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Re: pH question
« Reply #14 on: May 15, 2006, 09:27:58 AM »
But ethanoic acid is not a strong acid, I think??
It is a weak one
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