00:01
When looking at ionic equations for acid -based reactions, you need to know whether the acids and the bases are strong or weak.
00:10
So first of all, if we were to take a look at hydrobic acid and sodium hydroxide, we have a strong acid and a strong base.
00:24
Now remember that acid -based reactions work like double displacement reactions.
00:28
We'll swap the cations.
00:29
And so we'll get sodium bromide.
00:34
All sodiums are soluble.
00:35
That's going to be aqueous.
00:38
And then we get hoh, which is also known as water.
00:43
And at least at room temperature, water is a liquid.
00:46
We'll assume these are being done at 25 degrees celsius.
00:51
All right.
00:51
So if we want to take a look at strong acids and bases, strong means completely ionized.
00:57
So we're going to wind up with h plus and b .r.
01:02
R -minus for sodium hydroxide, n -a -plus, and oh -m -a -m -a -m -a -m -s.
01:14
And then on the other side, sodiums, again, are soluble.
01:18
So sodium bromide will be in its ionized form, but water is a liquid.
01:28
It stays together.
01:29
This is the complete ionic equation, but now we have to cancel out substances in order to form the net -ionic equation.
01:39
So whatever is found on both sides are spectators and don't participate.
01:45
So the bromides are on both sides, the sodiums are on both sides.
01:50
You can see the hydrogen and the hydroxide become water.
01:53
So that's not the same on both sides.
01:57
And that's what gets us our net ionic equation, which is just h plus oh h minus, is going to yield liquid water.
02:11
And when we have strong, strong acid -based systems, that's the only reaction that's occurring.
02:19
The other ions are spectators only.
02:24
Now, when you're dealing with weak systems, that's a little different.
02:30
And when we're talking about doing hydrofluoric acid and sodium hydroxide, the overall molecular equation will look the same.
02:40
We just switch the can ions, and so we'll get naf.
02:45
Sodiums are soluble, so that's aqueous, and water, which is a liquid.
02:52
However, hf is a weak acid, and so it does not break apart 100%...