Question

21. For each of the following precipitation reactions,

complete and balance the equation, indicating
clearly which product is the precipitate. If no reaction
would be expected, so indicate.
a. (NH4)2SO4(aq) + Ba(NO3)2(aq) →
b. HS(aq) + NiSO4(aq) →
c. FeCl3(aq) + NaOH(aq) →

Answer 1

I would say B.HS(aq)+NiSO4(aq)

Answer 2

The balance chemical equations are:

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

b.
`\( HS(aq) + NiSO_4(aq) \rightarrow H_2S(g) + NiS(s) \)`

c.
`\( 2FeCl_3(aq) + 6NaOH(aq) \rightarrow 2Fe(OH)_3(s) + 6NaCl(aq) \)`

a. the balanced equation shows that the precipitate is
`\( BaSO_4 \).`

b. the balanced equation shows that the precipitate is
`\( NiS \), and \( H_2S \)` is evolved as a gas.

c. The balanced equation shows that the precipitate is
`\( Fe(OH)_3 \).`

A chemical equation is a symbolic representation of a chemical reaction. It uses chemical symbols and formulas to express the substances involved in a reaction and the changes they undergo.

In a chemical equation, reactants are written on the left side of the arrow, and products are written on the right side.