Complete the table below by deciding whether a precipitate...

Complete the table below by deciding whether a precipitate forms when aqueous solutions A and B are mixed. If a precipitate will form, enter its empirical formula in the last column. solution A | solution B | Does a precipitate form when A and B are mixed? | empirical formula of precipitate --- | --- | --- | --- sodium hydroxide | iron(III) bromide | yes no | iron(II) sulfate | sodium sulfide | yes no | lead(II) nitrate | potassium sulfate | yes no |

Transcript

00:01 In this video, we want to consider some double replacement reactions and whether or not precipitates will form.

00:07 So the easiest way to do it is if you have two ionic compounds that are reacting in a double replacement, just take the cations and interchange them and that will give you your product.

00:15 So like sodium and iron, the first word are the names, sodium and iron are going to interchange.

00:23 So what do we get? well, we would get in this case, and i'll do everything in a different color.

00:31 So we can label it as or yeah, we could label it one, two, three.

00:36 So for number one, we'd get iron three hydroxide as our first species.

00:43 Let's see if that's going to be a precipitate because that's all we need is to find one that precipitates potentially.

00:50 So if you look at a table of solubility rules, you see that hydroxides are only soluble with certain alkali and alkaline earth metals.

01:02 Or ammonium, so iron three hydroxide, that's not soluble.

01:06 So that is going to precipitate.

01:08 So yes, we do have a precipitate for me.

01:12 And then what will be the formula? so iron three plus, iron three is fe3 plus.

01:18 The roman numeral indicates the charge for this transition metal.

01:21 And hydroxide is oh -h -minus.

01:24 So if we have a three -plus and oh -h -minus, in order to write the balanced neutral formula, we can sort of flip the charges as subscripts.

01:35 So we'll have 1fe for every 3 ohs, putting it in parentheses because it's a polyatomic ion.

01:44 All right.

01:46 For the second one, now we have iron two.

01:48 We're interchanging with sodium.

01:52 So let's see, so we have sodium sulfate...

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