d Mohr's salt or Ferrous ammonium sulphate is the inorganic compound with the formula $\left( NH _4\right)_2 F$ e $\left( SO _4\right)_2 \cdot 6 H _2 O$. It contains two different cations $Fe ^{2+}$ and $NH _4^{+}$hence, also classified as a double salt.
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