Predicting the formula of ionic compounds with common... Write the empirical formula for at least four ionic compounds that could be formed from the following ions:
Pb4+, PO3-4, CO2-3, Fe3+

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

hope this : -)

tony (lordcaos066)