Give formulas for the following. a. Hexakis(pyridine)cobalt(III) chloride b. Pentaammineiodochro

step 1 We are to give the formula for the following. The first one is exarchase, Cobot 3, exasperidine,

Give formulas for the following. a....

Key Concepts

Coordination Compound Nomenclature

This concept involves the systematic method for naming complexes based on IUPAC rules. It includes ordering of ligands (usually in alphabetical order), the use of appropriate prefixes to indicate the number of each type of ligand, naming of the central metal atom with its oxidation state indicated in Roman numerals, and distinguishing between neutral and anionic complexes by the ending of the metal name. This systematic approach allows chemists to deduce structural formulas from names and vice versa.

Ligand Representation

Ligands are ions or molecules that donate electrons to a metal center, and they can be neutral or anionic. Understanding how to represent ligands, including using terms such as mono-, bi-, or polydentate for ligands like pyridine, ammonia, chloride, or ethylenediamine, is essential. Their notation not only affects naming but also formula derivation, as the nature and number of coordinating atoms influence the overall charge and geometry of the complex.

Oxidation State Determination

Determining the oxidation state of the central metal in a coordination complex is crucial for constructing its formula and understanding its reactivity. This involves accounting for the charges of the ligands and any counterions present, thereby allowing the chemist to correctly assign the overall charge of the complex ion and subsequently balance it with appropriate counterions.

Charge Balancing and Complex Formula Construction

Once the oxidation state and the ligands are identified, stoichiometry and charge balancing are used to construct the complete chemical formula. This includes writing the coordination sphere with the appropriate number of ligands, enclosing them in brackets if necessary, and adding the correct number and type of counterions to neutralize the charge of the complex. This systematic approach ensures that the molecular formula accurately reflects the composition and net charge of the coordination compound.

Transcript

00:01 We are to give the formula for the following.

00:04 The first one is exarchase, cobot 3, exasperidine, cobalt 3, chloride.

00:23 So exact case means 6, so cobot 3, period in exactase.

00:35 So that's 6, periodine, then chloride, just one chloride, and it's a cobot 3.

00:53 So being cobot 3 means the cobot has to have an oxidation state of plus 3.

01:10 The question does not tell us that it is a cation or it's an an ion.

01:14 So this complex is not an ion.

01:17 So in order to make a cobot to have an oxidation state of plus 3, this chloride will not be in the bracket.

01:24 So it's going to be house side of the bracket.

01:28 And we're going to have exarchase corbates.

01:35 That's fine.

01:36 Cobot 3.

01:37 Peridin is neutral.

01:38 So to have cobot 3, this has to be 3 plus, right? and that means we have to have 3 chlorine canterhyer, or chloride canterhyer.

01:51 Next one is pentamine, iodide, chromium, 3, hyudide.

02:12 So here we have chromium has the method and we have pentaamin that means we have five immune ligand then we have iodine that means hyaline also coordinating to the matter center and it is an iodide compound so hyoid as canter ion.

02:37 So chromium here is plus three we have a minus one already in the bracket so minus 1 already.

02:48 So when the minus 1 cross over is going to be plus 1.

02:51 So we need plus 2 to make it plus 3 to have chromium 3.

02:56 So that means this is going to be 2 because hyadin will be high minus, 2 of it with 2 minus.

03:02 So 2 minus counter hanayon, we need 2 plus counter cauter such that when this i minus comes out, it can turn to plus 1 and then it can then halved the plus two to give the plus three to form the i, to form the chlorochromium 3.

03:21 Okay.

03:21 The next one is tris athlindiamine, nichl2 bromide.

03:46 So it's a nickel two compound.

03:55 And we are told that we have a trace of therine diamine.

03:58 So trees as lindiamine.

04:01 I represent an amine as an en.

04:03 And trees means that we have three of it.

04:07 And that's nickel two and it's bromide.

04:12 Okay.

04:15 So being nickel two, aoline damein is neutral.

04:18 So to have a charge, we need a plus two on this complex cartel.

04:28 So to have a plus 2, we need to make this to be br2 so that br is br minus, so times 2 of it will be minus 2.