Question

When the following solutions are mixed together, what precipitate (if any) will form? a. FeSO4(aq) 1 KCl(aq) b. Al(NO3)3(aq) 1 Ba(OH)2(aq) c. CaCl2(aq) 1 Na2SO4(aq) d. K2S(aq) 1 Ni(NO3)2(aq)

Answer 1

Answer: Precipitates form only in (b) (c) and (d) and these are $Al(OH)_3$  , $CaSO_4$ and NiS respectively.

Explanation: (a) The reaction will be:

$FeSO_4(aq)+2KCl(aq)\rightarrow FeCl_2(aq)+K_2SO_4(aq)$

The reaction will not take place as both the products are soluble and so no precipitate will form.

(b) The reaction will be:

$2Al(NO_3)_3(aq)+3Ba(OH)_2(aq)\rightarrow 3Ba(NO_3)_2(aq)+2Al(OH)_3(s)$

This reaction will take place as aluminum hydroxide is insoluble. So, the precipitate formed in this reaction is $Al(OH)_3$ .

(c) The reaction will be:

$CaCl_2(aq)+Na_2SO_4(aq)\rightarrow 2NaCl(aq)+CaSO_4(s)$

This reaction will take place as a precipitate of calcium sulfate(slightly soluble) will form.

(d) The reaction will be:

$K_2S(aq)+Ni(NO_3)_2(aq)\rightarrow 2KNO_3(aq)+NiS(s)$

This reaction will take place as NiS is insoluble. So, the precipitate formed in this reaction is NiS.

Answer 2

complete question:

When the following solutions are mixed together, what precipitate (if any) will form?

a. FeSO4 (aq) + KCl (aq)

b. Al(NO3)3 (aq) + Ba(OH)2 (aq)

c. CaCl2 (aq) + Na2SO4 (aq)

d. K2S (aq) + Ni(NO3)2 (aq)

Answer:

a. Using solubility rule this reaction will not precipitate because both potential precipitates are soluble.

b. The reaction will precipitate Al(OH)3

c. The precipitate is CaSO4

d. The precipitate is  NiS

Explanation:

a. FeSO4 (aq) + KCl (aq)

Using solubility rule this reaction will not precipitate because both potential precipitates are soluble.

FeSO4 (aq) + 2KCl (aq) → FeCl(aq) + K2SO4(aq)

b. Al(NO3)3 (aq) + Ba(OH)2 (aq)

The potential precipitate are Al(OH)3 and Ba(NO3)2

2 Al(NO3)3(aq) + 3 Ba(OH)2(aq) → 2 Al(OH)3 + 3 Ba(NO3)2

Al(OH)3 is insoluble while Ba(NO3)2 is soluble . The reaction will precipitate Al(OH)3

c. CaCl2 (aq) + Na2SO4 (aq)

The potential precipitate are CaSO4  and NaCl.

CaSO4 is insoluble while NaCl is soluble . The precipitate is CaSO4

Na2SO4 + CaCl2 → CaSO4 + 2NaCl

d. K2S (aq) + Ni(NO3)2 (aq)

The potential precipitate are KNO3 and NiS.

KNO3 is soluble while NiS is insoluble . The precipitate is  NiS

K2S(aq) + Ni(NO3)2(aq) → 2 KNO3(aq) + NiS(s)