Homework Help: Chemistry

Posted by Apple on Sunday, November 22, 2009 at 5:35pm.

For the following:
i) HClO4 > HBrO4 > HIO4
ii) NH3 > PH3 > AsH3 > SbH3
iii) HOClO3 > HOClO2 > HOClO > HOCl
iv) HBr>HCl>HF
The order of acidity is correct for which series?

1. ) all are correct
2. ) ii and iii
3. ) ii and iv
4. ) ii
5. ) i, iii, iv

Chemistry - DrBob222, Sunday, November 22, 2009 at 8:04pm
I don't see the correct answer listed. Tell us what you think (and why) and someone will be glad to comment.
Chemistry - Bodhi, Tuesday, November 24, 2009 at 1:03am
I've been able to rule out a few of them, but I'm not sure if it is right, and how to reason one of them.

I don't know how to go about reasoning for i).

For ii), bond lengths down a group increase, meaning that the compound is more acidic, making this one false.

For iii), the more central O atoms there are, the more acidic, making this one true.

For iv), the same applies as for ii), making this one true.

I'm guessing that i) is true since the only option that satisfies the statements that we know is 5).

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