Write the formula for each of the following compounds.

(a) Tetraammineplatinum(II) chloride

(b) Sodium hexacyanoferrate(III)

Video transcript

Hello, everyone. Today, we have the following problem determine the formula of the co-ordination complex below amine tetra aqua chromium two sulfate. So let's break down this given name. The amine indicates the presence of an ammonium ligand. And so because we only have one, there's only one of these ligands present. Now, you may also, you may also note that the Ambien is spelled with two M's and this is to differentiate it from organic Ams which just have the one M in their spelling. So we have that and now we need to look at our tetra aqua tetra means four and aqua means water. So this means that we have four water molecules present and then we have chromium two, the chromium two indicates that the metal center is chromium and the two signifies that it has a positive two charge. And then lastly, we have sulfate, which has a minus two charge. So putting this together, we first note that we have to put our chromium as our first leg in there, there's only one of them so we can get rid of your answer choice. A and the next thing that we want to do is, we want to put our water, we have four waters. And then we also want to include our ammonia in there. Note that charges of the chromium and the sulfate cancel each other out such that this is a neutral ion. So when we go to complete this, we will place our ammonium next, our ammonia next and then we will have our sulfate on the outside. And so if you look at an anti choice, ancho B best reflects this overall, I hope this helped. And until next time.