The Student Room Group
Reply 1
I would put it to 3.00
Reply 2
Yeah that's what I was thinking, cos the pH scale doesn't tend to mention decimal places does it? Thanks :-)
Reply 3
Surely it depends on the accuracy of your H+ molarity? For most practical purposes, you'll do it to 2 d.p. I guess, but it does depend on how accurately you know your H+ molarity.
remember this.... 3 is the magic number, so always do everything to 3 significant figures unless otherwise instructed or your doing analytical work which requires more accuracy..
I've always gone for the 3 sig figs rule. Besides, you won't be penalised for having 2.96if the required answer was 3, but you will be penalised if you put 3 instead of 2.96.

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