Homework Help 12.69

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Andrew Uesugi 3I
Posts: 38
Joined: Wed Sep 21, 2016 2:56 pm

Homework Help 12.69

Postby Andrew Uesugi 3I » Thu Dec 01, 2016 1:03 pm

So I've been working on question 12.69, and it's asking me to find the PH

For part A, it's asking me to find the PH of 0.19 M NH4Cl(aq).

So the first step is to create the formula for this. However, the student solution manual is telling me this:

NH4+ + H20 -> H30 + NH3

Whatever happened to the Cl part of NH4Cl? I'm confused. Don't worry about the answer, I just want to know why Cl is taken out of the chemical equation.

Jessie_Chen_2L
Posts: 20
Joined: Wed Sep 21, 2016 2:59 pm

Re: Homework Help 12.69

Postby Jessie_Chen_2L » Thu Dec 01, 2016 1:28 pm

The Cl ion does not affect the pH of the solution at all so we can just ignore it. Only the NH4 affects the pH because it can donate a proton to H2O.


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