7th edition 9C.3: Potassium Hexacyanidochromate (III)

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Chloe Thorpe 1J
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Joined: Fri Sep 28, 2018 12:16 am

7th edition 9C.3: Potassium Hexacyanidochromate (III)

Postby Chloe Thorpe 1J » Tue Dec 04, 2018 6:32 pm

The solutions say the formula is K3[Cr(CN)6]3-. Is it K3 since the ion has a 3- charge?

rikolivares
Posts: 24
Joined: Fri Sep 28, 2018 12:23 am

Re: 7th edition 9C.3: Potassium Hexacyanidochromate (III)

Postby rikolivares » Tue Dec 04, 2018 7:13 pm

Yes, since K has a charge of 1+ it would cancel out the 3- if there was three K

Imelda Mena 3I
Posts: 51
Joined: Thu Oct 02, 2014 3:00 am

Re: 7th edition 9C.3: Potassium Hexacyanidochromate (III)

Postby Imelda Mena 3I » Wed Dec 05, 2018 11:49 am

I understand how to get the formula from this coordination compound name when looking at the answer however I am still confused on a few things.

1) for things that have atoms/molecules outside of brackets, will the charges from the inside and outside always cancel each other out? In other words, will these always have an overall charge of zero? The ones that have something outside the brackets.

2) for this specific example, why do we write -ido at the end of cyano? What does -ido mean?


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