Predict whether each of the following ionic compounds is soluble in water or not and explain your answer:
a. Na_{3}PO_{4} b. CaCO_{3}
a. The ionic compound Na_{3}PO_{4} is soluble in water because any compound that contains Na^{+} is soluble.
b. The ionic compound CaCO_{3} is not soluble because it does not contain a soluble positive or negative ion.