Which reaction leads to the formation of a precipitate?
2cr(no3)3(aq) + 3feso4(aq) →
2rbf(aq) + cuso4(aq) →
2ca(oh)2(aq) + 2fecl3(aq) →

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.

The reactions in which one of the product is formed as a solid are called as precipitation reactions.

a)

b)

c)

93.2 ml + 3920 ml = 4013 ml total  

(93.2 ml) * (2.03 m) / (4013 ml) = 0.0471 m

the volume in in l of the diluted solution would be 0.0471 m.