00:01
Okay, so for this question we're looking for what precipitate, if anything, is formed when these solutions combine.
00:08
So always what i like to look for are those parts of the different solutions that are going to always be soluble.
00:17
So that always helps out.
00:19
So within sodium chloride, sodium is actually a cation that's always soluble because it is a group 1 cation and then nitrates are always soluble.
00:31
So that means that we know that that would not form a precipitate because the nitrate is going to make it soluble and so would the alkali metal.
00:41
So now we're left with lead 2 chloride.
00:45
Now chlorides tend to be soluble, but, oops, sorry about that, but lead 2 chloride actually is an exception.
00:57
So that would be the precipitate formed.
01:00
In the second one, as we look at lithium, lithium is another group 1 cation, so that is also always soluble and so is ammonium.
01:14
So even though sulfides tend to be insoluble, ammonium sulfide would be soluble.
01:21
So that means that there is no precipitate here...