sapling problem #1

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sapling problem #1

Postby Tiffanny_Carranza_2D » Fri Dec 04, 2020 8:23 pm

I am having trouble knowing how to name compounds so far I got this:

tetra ammine chloro colbat (II) chloride

im not sure what is wrong about that

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Re: sapling problem #1

Postby Mahnoor_Wani_1I » Fri Dec 04, 2020 8:32 pm


In naming coordination compounds, ligands are named in alphabetical order first and then the TM with their oxidation number.
From the compound above we can see that Cl2 and NH3 are the ligands. Since there are two cl anions it is dichloro and since there are 4 NH3 it is tetraammine.
So it should be tetraamminedichlorocobalt(III)chloride. The oxidation number is 3 for cobalt because the overall charge of the compound Is +1 (since the cl outside has the charge of -1) and since NH3 = 0, Cl = -2 the only way to have +1 is to have the oxidation state of +3 for the cobalt

Sharon Kim 2A
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Re: sapling problem #1

Postby Sharon Kim 2A » Fri Dec 04, 2020 9:29 pm

Since there are two chlorines in the compound, it would have to be "dichloro". So the negative charge would add up to be -3 instead of -2. Since the overall charge of the coordination compound is 0, we know that the oxidation number of cobalt would have to be +3.

Haochen He 3L
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Re: sapling problem #1

Postby Haochen He 3L » Sat Dec 05, 2020 4:45 am

Hi! There are two Cl in the complex ion, so it should be dichloro which has -2 negetive charges. In addition there is a cl (-1) atom outside. Given that the complex compound is neutral, Co should have +3 charges, written as Cobalt (III).

Andrew Yoon 3L
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Re: sapling problem #1

Postby Andrew Yoon 3L » Sun Dec 06, 2020 8:05 pm

You have most of the name correct. The only parts you have wrong in the name is the chlorine and the cobalt. Since there are 2 Cl anions in the backets, it would be dichloro instead of chloro. For the cobalt, it would be cobalt (III) because of the assigned charge. Since, we don't know the oxidation number for cobalt when looking at the compound by itself, we need to solve for it. The overall charge of the compound is 0. Each Cl has a charge of -1, which would make the total charge for the Cl's -3 (including the Cl outside). NH3 has a charge of 0. So in order for the compound to have an overall charge of 0, the charge for cobalt has to be +3.

Simran Bains 2C
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Re: sapling problem #1

Postby Simran Bains 2C » Sun Dec 06, 2020 8:10 pm

It should be dichlorvos and the cobalt should be (III)

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