Answer:
a) \(Ca(NO_3)_2\) is soluble
b) \(Mg_3(PO_4)_2\) is insoluble
Explanation:
Hi, the solubility of a salt in water depends of many variables such as the elements that form the salt (it's not the same the solubility of AgCl and NaCl), the temperature or the common ion effect if the water in the problem is not pure.
Being said that, some rules were established (known es the solubility rules) to ease the identification of soluble and insoluble salts.
For example:
- All nitrates (NO3) are soluble
- Most of the phosphates (PO4) are insolubles
Other examples:
- All acetates are soluble (except with Ag+)
- Most group I compounds are soluble
- Most carbonates and sulfites are insoluble (except with Group I and NH4+)
