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Classify the following as a weak or strong acid or base

Submitted by soulfire21 on Mon, 09/22/2008 - 15:37

2) NH3
3) HIO
4) Sr(OH)2

Here's what I think:
HCNO = weak acid
NH3 = weak base
HIO = strong acid
Sr(OH)2 = strong base

But the computer says it's wrong.

I've tried multiple variations of the above answers.  Our homework is submitted online, so I have used 3/10 submissions.

If you can help me out, let me know.  Thank you.

HCNO is weak
NH3 is weak
HIO is weak
Sr(OH)2 is strong

there are 6 common strong acids that you should memorize, while all others are considered weak. Also as a general rule, all arrhenius bases are strong exept NH3 and any molecule with an -NH2 group attached to it. these rules are very general, however they will hold true in almost every case.