Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Is this a redox reaction?

  1. Oct 22, 2017 #1
    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. jcsd
  3. Oct 22, 2017 #2

    TeethWhitener

    User Avatar
    Science Advisor
    Gold Member

    Check the oxidation states of each of the elements before and after the reaction. Do any of them change?
     
  4. Oct 22, 2017 #3
    I guess my real issue is that I'm not understanding which reaction is happening.
     
  5. Oct 22, 2017 #4

    Bystander

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Did it now?
     
  6. Oct 22, 2017 #5

    TeethWhitener

    User Avatar
    Science Advisor
    Gold Member

    Is HCl a strong acid or a weak acid? Is NH3 a strong base or a weak base?
     
  7. Oct 23, 2017 #6

    Borek

    User Avatar

    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?
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted