Question

what is the formula for calcium sulfate? what is the formula for aluminum carbonate? what is the formula for magnesium phosphate?

Explanation:

1. Magnesium has a +2 charge ($Mg^{2 + }$) and phosphate has a - 3 charge ($PO_{4}^{3 - }$). To balance the charges, the formula is $Mg_{3}(PO_{4})_{2}$.
2. Aluminum has a +3 charge ($Al^{3+}$) and carbonate has a - 2 charge ($CO_{3}^{2 - }$). To balance the charges, the formula is $Al_{2}(CO_{3})_{3}$.
3. Calcium has a +2 charge ($Ca^{2+}$) and sulfate has a - 2 charge ($SO_{4}^{2 - }$). The formula is $CaSO_{4}$.

Answer:

1. $Mg_{3}(PO_{4})_{2}$
2. $Al_{2}(CO_{3})_{3}$
3. $CaSO_{4}$