Naming

[Juliana Misirian]

When writing the name for the coordination compound, for example tetraamminediaquacobalt(III)bromide, the answer is . It seems like the overall charge of the coordination compound becomes the coefficient of the element outside of the brackets. Why is that?

[chemoyku dis 1B]

Hi!

This is because the complex coodination compound overall is neutral. Therefore, the complex inside the square brackets is 3+ charge and Br3 was added so that it could neutralise it with a 3- charge.

I hope this helps.

[azurexrose]

This happens to be a coincidence in this case just because Br- has a charge of only -1, so you need three to counteract a charge of +3 on the positive ion. If the ion were not -1, then you would need a different coefficient for the number outside the bracket; for example if the charge of the complex ion were -4 and the outside ion was Mg, then you would have 2 magnesium ions, even though the charge of the complex ion is 4.

[Carlie_Dorostkar_1A]

The charge of Br is -1 and there are 3 so you have a charge of -3 outside the coordination compound. There is an overall negative charge of the compound, the coordination compound charge must balance out the -3 and be +3. The total coordination compound charge is +3 but this is not what the coefficient element is. The coefficient element is the transition metal oxidation number.

[Brooklyn Burgess 3L]

When the complex ion is a cation, we use names such as ammine, aqua, and cyano. When the complex ion is an anion, we use the latin names such as aurate. They end in -ate.

[Albert 1I]

Br has a minus 1 charge and therefore the TM must have a plus three charge since there are three of them.

[cnyland]

Using the context clues of the other elements present you can find the charge of the metal

[Luke Schwuchow 14A]

Yes! When placing a chare on the transition metals, we have to calculate the charge on the compoud, without accounting for the transition metal's charge. In this case, the overall charge is -3, meaning in order to acheive a nuetral compound, cobalt needs a charge of 3, hence why the charge number is placed next to the transition metal.