Al2(CO3)3 empirical or molecular

Idon't understand what to put on the left lines i'm confused can anyone ?

Which of the following ocean acidification? are the most likely side effects of a ph less than 7.0 in the ocean b. more metal salts altering the ocean chemistry c. dissolution of the shells of marine organisms d. both a & b e. all of the above.

An experimental procedure requires a 10 ml of acid to be dissolved