Question

Which equation represents a precipitation reaction?a) LiBr (aq) + AgNO3(aq) › LiNO3(ag) + AgBr(s)b) BaCO 3(s) > BaO(s) + CO2(g)c) CaO(s) + SiO2(s) > CaSiO3(s)d) H2O(g)+ CO (g) > H2(g)+ CO2(g)

Answer 1

Let's see the concept of precipitation:

A precipitation reaction refers to the formation of an insoluble salt when two solutions containing soluble salts are combined.

For the first reaction, you can see that LiBr and AgNO3 are salts and they're soluble.

For the second reaction, you can see that BaCO3 is a salt that isn't soluble in water and BaO is an oxide.

In the third reaction, two oxides are reacting

And the fourth reaction are two oxides too.

So, what reaction shows us two solutions with salts each one are reacting and they're soluble? The first reaction. So, in this case, the precipitation reaction is the first reaction. The insoluble salt is AgBr and LiNO3 is soluble in water.