Question

For each of the following precipitation reactions, complete and balance the equation, indicating clearly which product is the precipitate.

a) Ba(NO3)2(aq) + (NH4)2SO4(aq) ->
b)CoCl3(aq) + NaOH(aq) ->
c)FeCl3(aq) + (NH4)2SS(aq) ->

Answer 1

Answer: a)
`Ba(NO_3)_2(aq)+(NH_4)_2SO_4(aq)\rightarrow BaSO_4(s)+2NH_4NO_3(aq)`

b)
`CoCl_3(aq)+3NaOH(aq)\rightarrow Co(OH)_3(s)+3NaCl(aq)`

c)
`2FeCl_3(aq)+3(NH_4)_2S(aq)\rightarrow Fe_2S_3(s)+6NH_4Cl(aq)`

Step-by-step explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.

The balanced chemical equations are:

a)
`Ba(NO_3)_2(aq)+(NH_4)_2SO_4(aq)\rightarrow BaSO_4(s)+2NH_4NO_3(aq)`

b)
`CoCl_3(aq)+3NaOH(aq)\rightarrow Co(OH)_3(s)+3NaCl(aq)`

c)
`2FeCl_3(aq)+3(NH_4)_2S(aq)\rightarrow Fe_2S_3(s)+6NH_4Cl(aq)`