Question: are phosphates soluble in water?
Answer: h) All phosphates are insoluble except those of sodium, potassium and ammonium. Some hydrogen phosphates, such as Ca(H2PO4)2, are soluble. I) All sulfides are insoluble except those of ammonium, sodium, calcium, potassium, magnesium, barium and strontium. All of these are slightly hydrolyzed in water.