does a salt or sugar change the ph of water

[td4azklz]

Does anybody know?

---

Members don't see this ad.

 

[ramin123]

I am sure that the ph of salt water is 7, so I do not believe there is a difference if you add salt to water.

 

[doc3232]

Yes it can IMO.
Sodium Acetate
The acetate will pick up protons
Probably raising pH to about 8

 

[td4azklz]

Yes it can IMO.
Sodium Acetate
The acetate will pick up protons
Probably raising pH to about 8

Yea, that's what i thought too

 

[td4azklz]

Yes it can IMO.
Sodium Acetate
The acetate will pick up protons
Probably raising pH to about 8

Wouldnt protons actually decrease the pH?

 

[alanan84]

Wouldnt protons actually decrease the pH?

Remember pH = -log[H+]. So as you decrease the amount of protons, you're going to increase the pH.

 

[ramin123]

Oh, I was not sure what you meant as salt-- i thought you meant NaCl. It depends on the salt you use: The example above increases the ph while if you add a salt like NH4NO3--- the ph of water will become acidic!

 

[td4azklz]

Remember pH = -log[H+]. So as you decrease the amount of protons, you're going to increase the pH.

right, by increasing pH, we are decreasing acidity. arent' we?

 

[ramin123]

Yes, exactly!

 

[flycd05]

Oh, I was not sure what you meant as salt-- i thought you meant NaCl. It depends on the salt you use: The example above increases the ph while if you add a salt like NH4NO3--- the ph of water will become acidic!

question: how does adding NH4NO3 make the solution acidic/decrease pH??

is this right...NH4 is ur spectator ion so u take NO3 + H20 --> HNO3 (strong acid) + OH- (strong base) which gives you a neutral solution of ph=7??

 

[doc3232]

question: how does adding NH4NO3 make the solution acidic/decrease pH??

is this right...NH4 is ur spectator ion so u take NO3 + H20 --> HNO3 (strong acid) + OH- (strong base) which gives you a neutral solution of ph=7??

No, NO3 will never take a proton.
NH4 will give one off though.
NH4 giving the solution some protons will make it more acidic.
hence pH will drop.

 

[td4azklz]

No, NO3 will never take a proton.
NH4 will give one off though.
NH4 giving the solution some protons will make it more acidic.
hence pH will drop.

I totally agree with you doc3232

 

[td4azklz]

I totally agree with you doc3232

While I understand what you are saying, i do have one question. Why wont NO3 ever take H? Thanks

 

[mistero]

HNO3 is a strong acid and we assume it is 100% ionized

 

[doc3232]

Well, it can...but it won't because it EXTREMELY stable as is. One of the strong acids.
The thing about strong acids is that it like grabbing a random but very stable molecule (don't take this literally but just for the point) and sticking a Hydrogen on it. It just gives it up first chance it gets.
I can explain NO3's stability but that is something else.