Question

Pb^{2+} SO_{4}^{2-} = PbSO_{4}

2+ and 2- cancel each other out.

Pb^{2+ }Cl^{-} = PbCl_{2}

Where does the 2 from Cl_{2} come from?

Step 1

In PbSO_{4} the valency of lead and sulfate are +2 and -2, hence they cancel out each other. The formula is determined by criss-cross method as shown below.

Step 2

Now since the ratio of the two valency is 2:2, therefore the formula should be Pb_{2}(SO_{4})_{2} but we take the simplest ratio which is 1:1. Therefore the formula becomes PbSO_{4}.

Step 3

Now similarly for PbCl2, the criss...

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