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What is the chemical formula for barium chloride enneahydrate?

Discussion in 'Design and technology' started by alfachemistry, Nov 25, 2017.

  1. alfachemistry

    alfachemistry New commenter

    Whenever a chemical name is followed by "[prefix]-hydrate", first ignore this last part of the name; hence, write CuCl2. Then, consider that last word - it indicates that there are a number of water molecules corresponding to the prefix - four in this case. The formula is CuCl2 · 4H2O.

    FeCr2O7: The two elements chromium and oxygen together form a polyatomic ion, Cr2O7(2-), which is known as the dichromate ion. Since it has a -2 charge, the iron must have a +2 charge. Therefore, the name is iron(II) dichromate.

    Barium dihydrogen phosphate: "Dihydrogen phosphate" is a polyatomic ion formed by adding two H+ units to the phosphate ion, PO4(3-). Therefore, the ion has formula H2PO4-. Since barium takes the +2 state, the formula is Ba(H2PO4)2.

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