Question

Which combination will produce a precipitate?

A) NaOH (aq) and HCl (aq)
B) KOH (aq) and Mg(NO3)2 (aq)
C) NaC2H3O2(aq) and HCl (aq)
D) AgNO3(aq) and Ca(C2H2O3) (aq)

Answer 1

Answer:

d produces a precipitate

Answer 2

$Ca(C2H2O3) (aq)$Option (B) $KOH (aq)$ and $Mg(NO3)2 (aq)$  the combination will produce a precipitate

Explanation:

A precipitation reaction is a reaction in which the precipitate is formed which is an insoluble solid which emerges from a liquid solution. These insoluble solids in the solution is called precipitation.

A) Neutralization reaction between hydrochloric acid $HCl$and sodium hydroxide$NaOH$ counts as a double displacement reaction. However, this reaction produces no precipitate.

B) $Mg(NO 3) 2 (aq) + 2 KOH (aq)--- Mg(OH) 2 (s) + 2 KNO 3$

This is a precipitation reaction: Mg(OH) 2 is the formed precipitate. ; Odorless, white or slightly yellow lumps, rods, flakes, sticks, or pellets.

C)  $NaC2H3O2(aq)$and $HCl$ (aq) is not precipitation reaction.

D) $AgNO3(aq)$and $Ca(C2H2O3) (aq)$ is also not precipitation reaction.