Question

Which of these reactants will produce a precipitate if they react?

NaC2H3O2+ HCI
NaOH + HCI
NaNO3 + CaCl2
KOH + Mg(NO3)2

Answer 1

KOH+Mg(NO3)2

Step-by-step explanation:

The double replacement reaction will result in:

2KOH(aq) + Mg(NO3)2
`\\`(aq)--> 2KNO3(aq) + Mg(OH)2(s)

Solubility rules prove that Mg+OH^- is insoluble and will result in a precipitate (solid)