Self Test 17.3B (a)

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Hannah Chew 2A
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Joined: Fri Sep 29, 2017 7:05 am
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Self Test 17.3B (a)

Postby Hannah Chew 2A » Wed Nov 29, 2017 10:39 pm

Name the compound [CoBr(NH3)5]SO4

The back of the book states that the answer is pentaaminebromidocobalt(II) sulfate. I understand everything except for the charge of cobalt. Why is the Roman numeral II, rather than III?

Nehal Banik
Posts: 64
Joined: Thu Jul 13, 2017 3:00 am

Re: Self Test 17.3B (a)

Postby Nehal Banik » Thu Nov 30, 2017 12:08 am

The bromine itself has a -1 charge, and the sulfate has a -2 charge, therefore combined it has a -3 charge. It is meant to be +3 because subtract 1 and you get 2 which cancels out with the negative 2 from the sulfate ion. The answers in the back sometimes have small errors, but yes, you are correct.


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