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## Homework Statement

Potassium chromate is an important compound of chromium. It is composed of K

^{+}

and CrO

_{4}

^{2-}. Write the formula of the compound.

## Homework Equations

positive charge + negative charge = 0

## The Attempt at a Solution

I know how to do this problem by cross switching the charges but I want to know how to do it by finding the ratio. So what I tried to do was say that it takes 8 K to equal the negative charge of the CrO

_{4}so the ration is 8:4. That means K

_{8}= CrO

_{4}. Then I reduced and got K

_{2}= CrO. The correct answer is K

_{2}= CrO

_{4}.