Potassium chromate is an important compound of chromium. It is composed of K+
and CrO42-. Write the formula of the compound.
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 CrO4 so the ration is 8:4. That means K8 = CrO4. Then I reduced and got K2 = CrO. The correct answer is K2 = CrO4.