[Junelc]

Hi! I truly don't understand this problem

Suppose that you mix 0.025 L of NaOH 0.1 M  with 0.020 L of NH4Cl 0.01 M.

Then they ask me to draw the titration curve, where I have to suggest a titrant, the concentration of that titrant and indetify what indicators should I use.

Here's my attempt:

I know that if I combine NaOH with NH4Cl the following happens:

NaOH + NH4Cl -----> NaCl + NH4OH

I know as well that NaCl is a neutral salt (neither of its ions undergo hydrolisis) so it has nothing to do with the titration.

I  also know that I get NaOH in excess in the reaction. So what do I have a mixture of two bases? (that would be the analyte)

And I also think that a proper titrant could be HCl (strong acid)

However, I can't figure out how to do it . How would I solve that?

Thanks in advance! This is driving me crazy and I'm just starting with titrations

[Borek]

You should brush your acids and bases. Especially Bronsted-Lowry theory.

NH₄Cl is not a base. It dissociates into NH₄⁺ and Cl^-. Ignore Cl^- and concentrate on NH₄⁺.

[Junelc]

You should brush your acids and bases. Especially Bronsted-Lowry theory.

NH₄Cl is not a base. It dissociates into NH₄⁺ and Cl^-. Ignore Cl^- and concentrate on NH₄⁺.

I'm sorry but I don't quite understand what you¡re trying to explain to me  . Ok, I do know that NH4Cl is an acid salt, but I still don't don't know how to solve that problem (how to draw the titration curve).

[Arkcon]

Write a different reaction instead, this time between NH₄⁺ and NaOH.

[Junelc]

Write a different reaction instead, this time between NH₄⁺ and NaOH.

Hmmm ok.. Would it be?:

NH4+ + NaOH ------> Na+ + NH3 + H2O

However, I still don't know how could I do the titration 

[Arkcon]

Write a different reaction instead, this time between NH₄⁺ and NaOH.

Hmmm ok.. Would it be?:

NH4+ + NaOH ------> Na+ + NH3 + H2O

However, I still don't know how could I do the titration 

There's an a-ha moment coming up for you.  What are the states of matter fro your products?

[Borek]

NH4+ + NaOH ------> Na+ + NH3 + H2O

However, I still don't know how could I do the titration  

How is your equation different from

CH₃COOH + NaOH -> Na⁺ + CH₃COO^- + H₂O

which is a standard equation for an acetic acid titration?

(Note: it should be Na⁺+OH^- on the left, I wrote it the way you did to make it easier to spot how these equations are identical).