Writing Double DIsplacement reactions

[AbiVic21]

I am not sure how to set up the reaction equation for the problem, For a particular reaction, you need some solid manganese (VII) sulfide. You go look in the chemical cabinet but you're out. So, you decide to make some yourself by mixing a solution of manganese (VII) nitrate with a solution of ammonium sulfide. (Once the solid is formed, you can filter it out of solution).

[ChenBeier]

Manganese VII sulfide is not existing. Manganese-VII is only available as oxides or as anion in Permanganate.

But theoretically a equation can be formed.

Write down the formulas first.