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Topic: ph level  (Read 15046 times)

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gangsta

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ph level
« on: April 19, 2006, 02:25:25 PM »
Please, Please, Please someone help me I'm in a slump. What is the basic Ph level for nitrate at 20c or room temperature? I looked everywhere for the answere and I cant seem to find it. The teacher wont lend me a hand so I'm stuck.
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Offline Borek

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Re: ph level
« Reply #1 on: April 19, 2006, 02:54:26 PM »
Is nitric acid strong or weak?
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spoudyal3

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Re: ph level
« Reply #2 on: April 24, 2006, 08:27:12 PM »
Nitric acid (HNO3) is a strong acid. Just as a referece, these are all the acids, in no particular order (although HCl is the strongest acid), that are generally accepted as being "strong":
  • HCl
  • HBr
  • HI
  • HNO3
  • HClO4
  • H2SO4

Good Luck!

-DaKid
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Offline AWK

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Re: ph level
« Reply #3 on: April 25, 2006, 01:40:53 AM »
Which nitrate: ammonium, potassium, magnesium one?
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Offline pantone159

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Re: ph level
« Reply #4 on: April 25, 2006, 02:14:32 AM »
Quote from: DaKid on April 24, 2006, 08:27:12 PM
(although HCl is the strongest acid)

Actually, HCl is weaker than HBr which is weaker than HI.  (At least in water.)  All three are strong enough, however, that this doesn't really matter much.
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Offline Borek

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Re: ph level
« Reply #5 on: April 25, 2006, 03:13:40 AM »
Quote from: DaKid on April 24, 2006, 08:27:12 PM
Nitric acid (HNO3) is a strong acid. Just as a referece, these are all the acids, in no particular order (although HCl is the strongest acid), that are generally accepted as being "strong":

Of these listed HClO4 is the strongest. HNO3 - although strong - is relatively weak when compared to the rest. Still stronger than HSO4-
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spoudyal3

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Re: ph level
« Reply #6 on: April 26, 2006, 12:52:23 AM »
Whoa really guys? I always thought that HCl was the strongest stuff out there! Hmmm ... I need to talk to my chem teachers. Sorry, but I still can not find the answer to your question? We need a specific nitrate I think. Good luck.

-DaKid
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Offline AWK

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Re: ph level
« Reply #7 on: April 26, 2006, 02:13:52 AM »
Quote from: DaKid on April 26, 2006, 12:52:23 AM
Whoa really guys? I always thought that HCl was the strongest stuff out there! Hmmm ... I need to talk to my chem teachers. Sorry, but I still can not find the answer to your question? We need a specific nitrate I think. Good luck.

-DaKid
There are also stronger acids than HClO4, but outside the Borek list
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spoudyal3

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Re: ph level
« Reply #8 on: April 27, 2006, 11:25:28 PM »
Hmmm ... Borek list? Sorry, I am unfamiliar with this list. Never heard of it in my life (hope it is not the list I gave)! What exactly is it (other than a list of acids of course). Thanks.

-DaKid
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Offline mike

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Re: ph level
« Reply #9 on: April 27, 2006, 11:29:21 PM »
I don't think that the "Borek List" is an official chemistry term (maybe one day). I think they just mean the acids Borek was talking about.
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spoudyal3

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Re: ph level
« Reply #10 on: April 27, 2006, 11:32:10 PM »
HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHA ....HAHAHAHAHAHAHAHAHAHAHAHAHA...HAHAHAHAHAHAHAHAHAHAHAHAHA....HA! My bad. I get it now. How about we just let that one slide, okay guys?

-DaKid
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Offline Donaldson Tan

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Re: ph level
« Reply #11 on: April 28, 2006, 09:41:39 PM »
Nitric acid is a strong acid, so you can consider 100% dissociation to calculate its pH.

pH = -log10(concentration of HNO3)
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Offline Borek

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Re: ph level
« Reply #12 on: April 29, 2006, 03:28:39 AM »
pKa = -1

Strong, but much weaker than others.

For 1M solution difference is 0.04 pH unit.
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Offline rctrackstar2007

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Re: ph level
« Reply #13 on: May 05, 2006, 02:57:41 PM »
Quote from: gangsta on April 19, 2006, 02:25:25 PM
Please, Please, Please someone help me I'm in a slump. What is the basic Ph level for nitrate at 20c or room temperature? I looked everywhere for the answere and I cant seem to find it. The teacher wont lend me a hand so I'm stuck.


To answer this, nitrate has no pH individually. For there to be a pH level there has to be a hydronium ion concentration and as any good chemist might have noticed, there are no H+ ions in NO3(2-). If you are looking for the pH of nitric acid that is completely different.
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Offline Borek

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Re: ph level
« Reply #14 on: May 05, 2006, 03:22:20 PM »
Quote from: rctrackstar2007 on May 05, 2006, 02:57:41 PM
To answer this, nitrate has no pH individually. For there to be a pH level there has to be a hydronium ion concentration and as any good chemist might have noticed, there are no H+ ions in NO3(2-). If you are looking for the pH of nitric acid that is completely different.

Have you heard about hydrolyzis? Bronsted-Lowry's acids and bases?

http://www.chembuddy,com/?left=pH-calculation&right=bronsted-lowry-theory
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