# Homework Help: Is this a redox reaction?

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1. Oct 22, 2017

### alphaj

Quick note:
Sorry for dominating the homework help board, guys! But, I wanted to say thank you to everyone who replies to my excessive questions. This forum's input has become integral to me as I am in a position now where I can't go to my teacher for help because of the logistics of commuting :(. SO, THANKS!

1. The problem statement, all variables and given/known data
Redox or not? Ammonium chloride, dissolved in water

2. Relevant equations
n/a

3. The attempt at a solution
I think...when we dissolve, the salt dissociates into its ions.
NH4+Cl---water--> NH4+ + Cl- (If this is the case, no redox.)

But, are we considering some sort of substitution reaction with water's ions?
NH4Cl+H2O = NH4+ + Cl- + H2O = NH4+ + HCl + OH-?
OR
NH4Cl + H2O = NH4 + Cl- + H2O = NH3 + HCl + H2O

I'm not quite sure how this would proceed...But, in both, Cl is not oxidized or reduced. In one, NH4 stays the same (+1 charge). And in one, H2O lost a proton, so it was...reduced?

2. Oct 22, 2017

### TeethWhitener

Check the oxidation states of each of the elements before and after the reaction. Do any of them change?

3. Oct 22, 2017

### alphaj

I guess my real issue is that I'm not understanding which reaction is happening.

4. Oct 22, 2017

### Bystander

Did it now?

5. Oct 22, 2017

### TeethWhitener

Is HCl a strong acid or a weak acid? Is NH3 a strong base or a weak base?

6. Oct 23, 2017

### Staff: Mentor

TeethWhitener nailed the question about which reaction really takes place.

Whether it is a redox:

Does the oxidation number of any of the ELEMENTS involved change?