Nh4no3

[atlanta213]

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According to Destroyer, NH4 and NO3 are both spectator ion. Then, when you find the PH ( acidic or basic), how do you determine which one is spectator ion between two?

Thanks

 

[osimsDDS]

I dont understand your question, but NH4+ and NO3- are always soluble...

Can you rephrase your question and maybe ill try to help, thanks

 

[atlanta213]

It is Gen chem #23 in destroyer.

When you determine whether a molecule is acidic and basic, you remove spectator ion and see it form H+ or OH-. However, i do not know which one is spectator ion in this case since destroyer mentioned both are spectator ions.

 

[osimsDDS]

They are all soluble, in this situation these are all salts formed from a base and an acid. To solve this problem you have to work backwards actually, lets do each one out:

a) KBr, formed from KOH (strong base) with HBr (strong acid) = pH of 7
c) NaF, formed from NaOH (strong base) with HF (weak acid) = pH > 7
d) KCN, formed from KOH (strong base) with HCN (weak acid) = pH >7
e) Na2CO3, formed from NaOH (strong base) with HCO3 (weak acid) = pH >7

Now for B, NH4NO3 it formed from NH3 (weak base) with HNO3 (strong acid, nitric acid not to be confused with nitrous acid which is formed from NO2, to remember this...the suffix -ite forms -ous while -ate forms -ic) so anyways here you have a weak base with a strong acid will give you a pH <7 and acidic...

The question tells you that these are all salts, meaning that they are all soluble (ionic compounds are soluble). The key is to know what formed them in solution then you can find out the pH...

Hope that helps...

 

[PooyaH]

It is Gen chem #23 in destroyer.

When you determine whether a molecule is acidic and basic, you remove spectator ion and see it form H+ or OH-. However, i do not know which one is spectator ion in this case since destroyer mentioned both are spectator ions.

In problems like this you need to identify the association of each one with strong acids and bases. For instance:

a) K is associated with a strong base (KOH) and Br is associated with a strong acid (HBr) so it's a salt and neutral.
c) Na is associated with a strong base (NaOH) but F is not associated with a strong acid or base, thus the solution must be basic!
d) K again is associated with a strong base (KOH) and CN is not associated with any strong acid, so the solution must be basic!
e) Na again is associated with a strong base (NaOH) but CO3 is not associate with any strong acid or base, so the solution is must be basic!
and finally
b) NO3 is associated with a strong acid (HNO3) but NH4 is not associated with any strong acid or base, so the solution must be acidic!!!

So always see if you find any association with strong acid or bases!!!

Hope it helps!

 

[PooyaH]

Oh shoot...I should've read Osims post first! so yeah basically the same thing 😀

 

[jdent]

OSimsdds nice job on explaining!