1.Rank the lead halide salts in order of their solubility in water? 2.Which is more soluble in water, NaIO3 or CSIO3? 3. Rank the group 2 Carbonates in order of thermal stability ?

1 Answer
anor277
Apr 30, 2018

How would we know without data?

Explanation:

You gots TWO iodates, #NaIO_3#, and #CsIO_3#.. I suspect that the caesium salt would be more insoluble. Why? Because, the caesium cation is LARGER than the sodium one, and thus there is probably a better size match between the caesium and iodate ion-pair, and thus DECREASED solubility.

But what do I know without data? I could not find them on the webz.

For the lead halide series...the webz provides these data for #K_"sp": PbCl_2(1.70xx10^-5);PbBr_2(6.60xx10^-6);PbI_2(9.80xx10^-9)#

...the which gives....

#underbrace(PbCl_2~=PbBr_2"<<"PbI_2)_(rarr)#
#"order of DECREASING solubility"#

Size matching between anion, and cation, probably again plays a part here.

As for the alkaline earth carbonates, you are probably going to have to consult your text. A size mismatch again probably LOWERS the temperature of decomposition....but you need data to argue your position.

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