Question

what is the formula for chromium (iii) carbonate?
cr₃(co₃)₂
cr₂co₃3
crco₃
correct answer not given

Explanation:

Step1: Determine the charge of chromium ion

Chromium (III) has a charge of \(Cr^{3 +}\).

Step2: Determine the charge of carbonate ion

Carbonate ion has a charge of \(CO_{3}^{2 -}\).

Step3: Use the criss - cross method

To balance the charges, we need 2 \(Cr^{3+}\) ions (\(2\times3 = 6\) positive charges) and 3 \(CO_{3}^{2 -}\) ions (\(3\times2=6\) negative charges). The formula is \(Cr_{2}(CO_{3})_{3}\).

Answer:

correct answer not given