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The formula is ##”K”_2″SO”_4##.
The name consists of two words, with the second word ending in -ate.
This tells you that the compound is a salt.
The first word is the name of the metal ion, and the second word is the name of the anion.
Write the symbol of the metal with its charge.
Potassium is in Group 1.
Its symbol is ##”K”## and its charge is +1: ##”K”^”+”##.
Sulfate is a polyatomic ion.
You have memorized the formulas your instructor gave you for the , haven’t you?
The formula for sulfate ion is ##”SO”_4^”2-“##.
Use the crisscross method to write the formula.
Write the charge on the first ion as the subscript of the second, and the charge on the second ion as the subscript of the first.
We omit subscripts of 1, and we do not include the parentheses around the polyatomic ion if its subscript is 1.
∴ The formula of potassium sulfate is ##”K”_2″SO”_4##.
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