Question

how many of the following salts are expected to be insoluble in water? sodium sulfide barium nitrate ammonium sulfate potassium phosphate a 4 b 2 c 3 d none e 1

Explanation:

Step1: Recall solubility rules

Salts of alkali - metals (sodium, potassium) and ammonium are generally soluble. Nitrates are always soluble.

Step2: Analyze each salt

1. Sodium sulfide ($Na_2S$): Sodium is an alkali - metal, so it is soluble.
2. Barium nitrate ($Ba(NO_3)_2$): Nitrates are soluble, so it is soluble.
3. Ammonium sulfate ($(NH_4)_2SO_4$): Ammonium salts are soluble, so it is soluble.
4. Potassium phosphate ($K_3PO_4$): Potassium is an alkali - metal, so it is soluble.

Answer:

D. none