Question

What is the formula for cobalt(II) chromate? Give your answer in the form A#B#, where the number is the subscript (don't include a 1 subscript explicitly). For example, the formula MgCl₂ would be entered as MgCl₂.

Answer 1

The formula for cobalt(II) chromate is CoCrO₄, where one cobalt ion with a +2 charge combines with one chromate ion with a -2 charge to form a neutral ionic compound.

Step-by-step explanation:

The formula for cobalt(II) chromate is CoCrO₄. In this compound, cobalt (Co) has a +2 oxidation state (hence cobalt(II)) and the chromate ion (CrO₄) has a -2 charge. The chemical formula indicates that one cobalt ion pairs with one chromate ion to form a neutral compound with no overall charge. Remember, when writing the formula for ionic compounds, the total positive charge must balance the total negative charge.