Achieve Week 9 #2

[Antonia Valencia 2H]

Hi! I'm not sure what the oxidation state is for the central metal atom in [Ni(CN)5]^3-. Thanks so much for the help!

[905749989]

Since CN has a negative 1 charge and there are five present cyanide molecules, in order for the overall charge of the compound to be negative three; Nickel must have an oxidation number of positive 2 to balance out the negative 5 charge to equal a net charge of negative three:

2-5=-3

[Jessica Cornelia Hongarta 1G]

Hi! So, for [Ni(CN)5]^3- , what we know is that the overall charge of this complex is -3 and that each CN has a charge of -1. So, inside the bracket we know that there are 5 CN, which gives us a total charge of -5. In order to have an overall charge of -3, the Ni has to have a charge of +2. Hope this helps!

[Amanda Tran 1D]

If we're given the compound, [Ni(CN)5]^3-, we know that the overall charge of the compound needs to be -3. CN has a charge of -1 and there are 5 of those within the brackets which gives us a charge of -5. Ni has to have an oxidation number that when added to -5, will give us -3. So this means that Ni should have oxidation number +2.

[Lily Dabrowski 2G]

[Ni(CN)5]^3-
Just looking at the exponent outside the bracket gives us the charge of the whole coordination compound, which we will use to find the oxidation state of the metal atom. So the total charge is 3-. Inside the brackets, (CN) is our ligand and Ni is our metal. CN has a charge of -1, and there are five (CN) molecules, so the total charge of this component is -5. To achieve the total charge of 3-, we need a 2+ charge for Ni.

[Joelle Tran 1K]

The CN has a charge of -1 and there are 5 CNs so 5*-1 = -5. Then, the overall charge of the compound is -3. So -3 = X - 5. Therefore, Ni's charge must be +2.

[Nathaniel John 2E]

Hello, the CN molecule has an overall charge of -1. Since there are five CN molecules, its total charge is -5. Therefore, since the overall charge of the molecule is -3, this must mean that the nickel atom has a charge of +2.

Hope this helps!

[trevina_brown_2A]

The CN has a charge of -1 so 5-1 = -5. The overall charge of the compound is -3 So -3 = X - 5. Because of that Ni's charge must be +2.