Question

Complete the table below by deciding whether a precipitate forms when aqueous solutions A and B are mixed. If a precipitate will form, enter its empirical formula in the last column. 

Answer 1

1- when zinc sulphate and sodium sulfide is mixed then a precipitate form of zinc sulphide (ZnS) is formed.

Sulphide of zinc is insoluble that form the precipitate whereas sulphate of sodium is soluble .

. Yes precipitate form

.empirical formula is ZnS

2-when iron bromide and and nickel acetate is mixed then there is no precipitate formed because after mixing iron acetate and nickel bromide both are soluble in water due to which both of them unable to formation of precipitate .

Ans. No precipitate formed

  

3- when potassium acetate and barium bromide are mixed then the product formed during this reaction that is potassium bromide and barium acetate both are soluble in water .so , no any precipitate formed

Ans .No precipitate formed

Solubility rules -----> salt of acetates are always soluble .

Salt of bromide is soluble with most ions except silver plus one ion, mercury plus two ion and lead plus 2 ion.

Salt of sulphide insoluble except for group 1A and 2 A and

ammonium ions.

Sulphate salts soluble except strontium , barium and silver salts