00:01
Hi there.
00:02
In this question, we are combining pairs of aqua -sionic compounds.
00:07
So what we have here is a double replacement reaction.
00:17
And in a double replacement reaction, we have these two aquaic ionic compounds reacting.
00:22
So i'm just going to give them generic symbols of ab and x, y.
00:29
And what happens is they exchange ions.
00:32
So a goes with y, and the positive ion from the second compound, x goes with the negative ion from the first.
00:43
So we're making a new combination of positive and negative ions.
00:46
By definition, we only have a reaction if we form a precipitate or an insoluble product.
00:53
So in this question, we have four combinations, and we want to know which one of them does not form an insoluble product.
01:02
Okay, so we're going to use our solubility rules, and the first thing we need to know is what the products are.
01:07
So in our first one in letter a, we have barium chloride reacting with sodium sulfate.
01:13
So when they exchange ions, we're going to get barium with sulfate and sodium with chloride.
01:25
Well, we know sodium with chloride is soluble.
01:28
However, when barium is combined with sulfate, that forms a precipitate.
01:34
So we have a precipitate here.
01:38
Therefore, letter a is not our answer.
01:40
We're looking for the pair that does not form a precipitate.
01:42
Precipitate.
01:44
In letter b, we have silver nitrate and potassium bromide.
01:48
So we get silver bromide and potassium nitrate forming...