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April 24, 2026, 10:28:38 pm
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Author Topic: Interesting questions (chem)  (Read 7884 times)  Share 

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Martoman

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Re: Interesting questions (chem)
« Reply #15 on: November 06, 2010, 10:44:40 pm »
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yay :) the molar mass thingy was cool
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luken93

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Re: Interesting questions (chem)
« Reply #16 on: November 06, 2010, 10:54:20 pm »
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Quote from: fady_22 on November 06, 2010, 10:30:30 pm
Quote from: Martoman on November 06, 2010, 10:20:50 pm
Equal masses of the following substances are dissolved in seperate samples of water to give 500ml of solution. Explain which solution would have the lowest pH.

Options to be dissolved are:

A) NH3
B) HNO3
C) HCl
D) HClO4

HCl.
A) is a base, so would have a higher pH than the rest of the options (which are acids).
The rest are all strong acids, but HCl would have the greatest number of mole in a given mass (as it has the lowest molar mass) and hence would produce the greatest concentration of H3O+, causing it to have the lowest pH. :)
I was going to say this, but I held back fearing some trick from Martoman's brilliance haha
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Martoman

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Re: Interesting questions (chem)
« Reply #17 on: November 06, 2010, 11:12:08 pm »
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Oh remember sometimes the most simplest way gets you the answer.

And also, I'm not TSFX.
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luken93

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Re: Interesting questions (chem)
« Reply #18 on: November 06, 2010, 11:24:39 pm »
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Quote from: Martoman on November 06, 2010, 11:12:08 pm
Oh remember sometimes the most simplest way gets you the answer.

And also, I'm not TSFX.
Hahaha, but I presumed that by you posting it, it was bound to be interesting?
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crayolé

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Re: Interesting questions (chem)
« Reply #19 on: November 06, 2010, 11:29:14 pm »
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Quote from: luken93 on November 06, 2010, 10:54:20 pm
I was going to say this, but I held back fearing some trick from Martoman's brilliance haha
LOLOL same
I had an answer all typed up then I imagined Martoman with a "HA! you have activated my trap card bahaha!" response at the ready and immediately withdrew my response :P
« Last Edit: November 06, 2010, 11:32:45 pm by crayola »
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Martoman

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Re: Interesting questions (chem)
« Reply #20 on: November 06, 2010, 11:49:44 pm »
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lol, well i knew this at an intuitive level but i found it lovely as a question.

Similarly:

NaOH Has a pH 13 in a solution. How much HNO3 must be added so the solution reaches pH 1?

yeahh..... put 1L solution here now this question makes more sense  :-[
« Last Edit: November 07, 2010, 09:46:26 pm by Martoman »
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98.40_for_sure

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Re: Interesting questions (chem)
« Reply #21 on: November 06, 2010, 11:54:43 pm »
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Quote from: Martoman on November 06, 2010, 11:49:44 pm
lol, well i knew this at an intuitive level but i found it lovely as a question.

Similarly:

NaOH Has a pH 13 in a solution. How much HNO3 must be added so the solution reaches pH 1?

A... lot
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Martoman

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Re: Interesting questions (chem)
« Reply #22 on: November 07, 2010, 12:01:41 am »
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quantify?
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Martoman

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Re: Interesting questions (chem)
« Reply #23 on: November 07, 2010, 08:03:05 pm »
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Succinic acid is a diprotic acid. Its first acidity constant is 6.2*10^-5.
Explain in terms of attraction why the second acidity constant would be much lower.
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kenhung123

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Re: Interesting questions (chem)
« Reply #24 on: November 07, 2010, 08:26:43 pm »
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Quote from: Martoman on November 06, 2010, 11:49:44 pm
lol, well i knew this at an intuitive level but i found it lovely as a question.

Similarly:

NaOH Has a pH 13 in a solution. How much HNO3 must be added so the solution reaches pH 1?
Does it give concentration of HNO3?
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Martoman

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Re: Interesting questions (chem)
« Reply #25 on: November 07, 2010, 08:27:28 pm »
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you don't need it
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kenhung123

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Re: Interesting questions (chem)
« Reply #26 on: November 07, 2010, 08:34:19 pm »
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Hmmmm...weird...c1v1=c2v2 does not work...
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Martoman

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Re: Interesting questions (chem)
« Reply #27 on: November 07, 2010, 08:35:38 pm »
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Thats why its in the interesting questions section
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Blakhitman

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Re: Interesting questions (chem)
« Reply #28 on: November 07, 2010, 08:39:56 pm »
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Quote from: Martoman on November 07, 2010, 08:03:05 pm
Succinic acid is a diprotic acid. Its first acidity constant is 6.2*10^-5.
Explain in terms of attraction why the second acidity constant would be much lower.

Cause it's already lost a proton and got a negative charge, pulling another proton off would require chuck norris skills.
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Martoman

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Re: Interesting questions (chem)
« Reply #29 on: November 07, 2010, 08:41:57 pm »
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excellent :D  lots of my friends when we had this question in a neap paper were like... second ionisation just happens to a lesser extent...
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