Question

Determine the chemical formula for the compound, potassiumtrisethylenediamine chromate(III).

A) K3[Cr(NH2CH2CH2NH2)3]
B) [K(NH2CH2CH2NH2)3]Cr3+
C) [KCr(NH2CH2CH2NH2)3]3+
D) K2[Cr(NH2CH2CH2NH2)4]
E) [Cr(NH2CH2CH2NH2)2]K2

Answer 1

The correct chemical formula for potassiumtris(ethylenediamine)chromate(III) is K3[Cr(NH2CH2CH2NH2)3], where the compound consists of a chromium complex ion with three ethylenediamine ligands and three potassium ions to balance the charge. So the correct option is A.

Step-by-step explanation:

The correct chemical formula for the compound potassium tris(ethylenediamine)chromate(III) is given by Option A: K3[Cr(NH2CH2CH2NH2)3]. This notation reflects that the compound contains three ethylenediamine ligands coordinated to a central chromium ion with a +3 oxidation state. The compound also contains three potassium ions to balance the charge of the chromium complex. Therefore, the chromium complex ion is [Cr(NH2CH2CH2NH2)3] and carries a 3+ charge due to the chromium being in the 3+ oxidation state. The three potassium ions, each with a charge of +1, balance the charge of the chromium complex, resulting in a neutral compound.

Answer 2

Answer: The correct answer is (A).

Step-by-step explanation:

Potassium-trisethylene-diamine chromate(III)

Potassium is coming first in name which means that potassium is present as cation.

In the complex, 3 molecules of 'ethylene-diamine' is present as an dianion and forms a complex with Chromium (III) metal, making the overall charge on the coordination sphere as (-3).

So, to make a neutral complex, 3 potassium ions are required.

Hence, the structure of the complex is
`K_3[Cr(NH_2CH_2CH_2NH_2)_3]`