Question

Write the number of individual ions per formula unit and the coordination number of the metal ion in each of the compounds below.

a. Ions:
b. Coordination number:

- Dibromobis(ethylenediamine)cobalt(III) sulfate:
- Hexaamminechromium(III) tetrachlorocuprate(II): −
- chromium in above compound: −
- copper in above compound: −
- Potassium hexacyanoferrate(II):

Answer 1

Dibromobis(ethylenediamine)cobalt(III) sulfate has 1 dibromobis(ethylenediamine)cobalt(III) ion per formula unit with a coordination number of 6 for the cobalt ion. Hexaamminechromium(III) tetrachlorocuprate(II) contains chromium(III) ion with a coordination number of 6 and copper ion with a coordination number of 4. Potassium hexacyanoferrate(II) contains potassium ion and hexacyanoferrate(II) ion.

Step-by-step explanation:

1. (a) For the formula unit: Dibromobis(ethylenediamine)cobalt(III) sulfate has 1 dibromobis(ethylenediamine)cobalt(III) ion per formula unit. A dibromobis(ethylenediamine)cobalt(III) ion consists of one cobalt atom coordinated to two ethylenediamine ligands and two bromide ions.
2. (b) Coordination number of the metal ion: In dibromobis(ethylenediamine)cobalt(III) sulfate, the cobalt ion has a coordination number of 6. This means that it is surrounded by six ligands.

1. Ions: In the compound hexaamminechromium(III) tetrachlorocuprate(II), there are two types of metal ions present - chromium(III) ion and tetrachlorocuprate(II) ion.
2. Coordination number: The chromium ion in hexaamminechromium(III) tetrachlorocuprate(II) has a coordination number of 6, as it is surrounded by six ammonia ligands. The copper ion in the tetrachlorocuprate(II) ion has a coordination number of 4, as it is surrounded by four chloride ligands.

1. Ions: The compound potassium hexacyanoferrate(II) contains two types of ions - potassium ion and hexacyanoferrate(II) ion.