I tried to get the formula of potassium ammonium sulfate. What I got is $\ce{K(NH4)2SO4}$ but I don't think this the right formula. I searched on the internet and found an answer ($\ce{KNH4SO4}$), but I don't think it is correct.

So what is the correct formula of potassium ammonium sulfate?

  • $\begingroup$ It would help if you explained your logic for why you think $\ce{K(NH4)SO4}$ is incorrect and why $\ce{K(NH4)2SO4}$ should be the answer. $\endgroup$ Jun 20, 2014 at 16:17
  • 1
    $\begingroup$ your answer doesn't have zero net charge $+1(\ce K)+2(\ce{(NH4)2})-2(\ce{SO4})=1\ne0$ but $+1(\ce K)+1(\ce{NH4})-2(\ce{SO4})=0$ $\endgroup$
    – RE60K
    Jun 20, 2014 at 16:38
  • $\begingroup$ oh yes ! you are right ! I didn't pay attention for the net charge $\endgroup$
    – Maher
    Jun 20, 2014 at 17:27

1 Answer 1


$\ce{K(NH_4)SO_4}$ is the correct formula. You have two unipositive cations and a single dinegative anion. The total charge must be zero.

structural formula of the ionic compound


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