00:01
All right, so we're going to look to balance the equation between ammonium sulfide.
00:06
Ammonium is nh4 with a charge of plus one.
00:10
S with a charge of minus two.
00:13
So we need two ammoniums to balance out the charge of the sulfide.
00:17
We're told that's aqueous.
00:20
We're going to react that with barium chloride.
00:22
Barium as an ion is plus two.
00:25
Chloride is minus one.
00:27
So b, a, c, l2 is the formula for barium chloride.
00:31
Now, when we do this chemical reaction, this is a double replacement reaction.
00:36
So the two cations will swap places.
00:39
The b .a will go with the s.
00:41
B .a is plus two.
00:44
Sulfide is negative two.
00:45
So we just need one of each of those.
00:48
And then we have ammonium going with the chloride...