What is the name of $P b_{3} P_{2}$ $Pb_3P_2$ ?

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What is the name of $P b_{3} P_{2}$ $Pb_3P_2$ ?

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Answer 1 · 2016-10-12T05:54:04

Lead $(I I)$ $(II)$ phosphide

Explanation:

$P b =$ $Pb=$ lead
$P =$ $P=$ phosphorus $\to$ $->$ the phosphorus anion is phosphide ( $P^{3 -}$ $P^(3-)$ )

It is important to note that this is phosphide, not phosphate, as the anion does not have oxygen attached
Phosphate $= P O_{4}^{3 -}$ $=PO_4^(3-)$

If you are not sure about the oxidation state of lead, add up the oxidation state of the phosphide $P^{3 -}$ $P^(3-)$ ions and see what is needed to cancel it out to make it neutral (as this is a compound with a neutral charge).

Oxidation state of $P^{3 -}$ $P^(3-)$ is $- I I I$ $-III$ , since it has gained 3 electrons
There are 2 $P^{3 -}$ $P^(3-)$ in the compound, so $2 \cdot - I I I = - V I$ $2*-III=-VI$
To cancel out $- V I$ $-VI$ , we need $+ V I$ $+VI$
There are 3 lead ions, so $\frac{V I}{3} = I I$ $(VI)/3=II$

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What is the name of $P b_{3} P_{2}$ $Pb_3P_2$ ?

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