00:01
Okay, so in order to predict whether a reaction is going to occur in aqueous solution, you need to ask yourself whether one of your products is going to form a precipitate, a gas, or water.
00:13
So, for example, let's go through this first problem to see what kind of products we form.
00:17
So we can recombine sodium and, so we have a reaction between sodium hydroxide and ammonium sulfate.
00:24
So if we recombine sodium and sulfate, sodium has a plus one charge, sulfate has a minus two, charge.
00:31
So we would have n -a -2 -s -o -4.
00:36
And likewise, we can recombine hydroxide, which has a negative one charge, an ammonium which has plus one charge.
00:43
So we have n -h -4 hydroxide.
00:48
Now if we go through, we can balance this out.
00:51
So we need to balance out our ammonium.
00:53
So now we have two and two.
00:55
And we need to balance out our sodiums.
00:57
Now we have two and two.
00:57
And we also have two hydroxides on both sides of the equation.
01:02
So these products are actually both aqueous.
01:07
So because both of our products are going to be soluble in an aqueous solution, there's going to be no reaction that occurs.
01:16
So for the second problem between niobium -5 sulfates and barium nitrate, let's do the same thing where let's go ahead and draw out our products.
01:26
So niobium is going to have a positive 5 charge and our nitrate has a negative 1 charge.
01:32
So we'll have nb, n03, 5.
01:38
And likewise, we're going to have barium, which has a positive 2 charge.
01:43
Sulfate has a negative 2 charge.
01:46
And then we'll form barium sulfate.
01:48
And now we just need to go through and balance it out.
01:51
So we have five sulfate.
01:54
You need to balance out five sulfates...