TBR Chem 1 Questions

[dudewheresmymd]

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Hey everyone,
Anyone that has insights feel free to chirp in:

p. 271 #19- pka HBro2 > HClO2 (pka=1.9), why can't it be pka 1.92, does it have to be significantly greater?

p.269 #5, what does the answer explanation mean by "the weaker the conjugate base, the stronger the acid that is required to react with it? so for example, Br-, I-, they need strong acids to react with them? Bit confused by wording

p. 209 (ion exchange) #55, I don't understand why on p.228 [H3o+] = 2[Sr2+}..this is bugging me, anyone who can explain this?

Thanks!

 

[milski]

p 271: Look at the differences between HOBr and HOCl (about 1.3) and between HClO₄ and HBrO₄ (about 4.2). It would not make sense the difference between the -ous acids to be only 0.02.

p 269: Pretty much. What would be the reaction between Br- and a weak acid? You cannot expect the weak acid to dissociate and protonate the Br-.

p 209: Conservation of charge. For each Sr²⁺ you get two H⁺. If you have one Sr ion, you'll have two or 2*1 hydrogen ions.