The bond used between zinc acetate is ionic, and the easier way to learn to write such a formula is to learn to place the ions first, and then crisscross their charges.
The bond that forms zinc acetate is ionic. Zinc forms 2+ cations, with the formula ##”Zn”^(2+)## and acetate is a polyatomic anion with the formula ##”C”_2″H”_3″O”_2″^−##.
Since the compound needs to be neutral, the total positive charge must equal the total negative charge, so the formula for zinc acetate requires one ##”Zn”^(2+)## and two ##”C”_2″H”_3″O”_2″^−## ions.
The formula is then ##”Zn”(“C”_2″H”_3″O”_2)_2##. The formula for the acetate ion is placed in parentheses with a subscript of 2, indicating that two acetate ions with a 1- charge are required to bond with one zinc ion with a 2+ charge. Now the total positive charge is 2+ and the total negative charge is 2-, giving an overall charge of zero for the zinc acetate compound.
A very easy method for is called the crisscross method. It is shown in the diagram below.
Since a chemical formula for an ionic compound must indicate the lowest whole-number ratio of ions, sometimes after crisscrossing you must reduce the ratio.
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