The formula of a compound is `Ca_(3)(PO_(4))_(2)`. What is the valency of Ca in it?

Ca_(3)(PO_(4))_(2) is :

Ca_(3)(PO_(4))_(2) +H_(2)SO_(4) to

Fill in the blanks. a) In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called law of conservation of mass. b) A groupof atoms carrying a fixed charge on them is called polyatomic ion. The formula unit masss of Ca_(3)(PO_(4))_(2) is 310g. d) Formula of sodium carbonate is .............. and that of ammonium sulphate is.............

What is the valency of PO_(4) in the compound Ca_(3)(PO_(4))_(2)

The equivalent mass of calcium phosphate Ca_(3) ( PO_(4))_(2) ( Mol. wt. = 310 ) is -

Ca_(3)(PO_(4))_(2) is insoluble in in water. On adding a few drops of HCI to solid Ca_(3)(PO_(4))_(2) in contant with water, the solid dissolves. The reason is: