Final 2012

The Conjugate Seesaw

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Final 2012

Postby Blake_Katsev_2E » Wed Nov 30, 2016 11:32 pm

why in question 8 is there only 3 sig figs?

Jared Faith 4E
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Joined: Wed Sep 21, 2016 2:57 pm

Re: Final 2012

Postby Jared Faith 4E » Thu Dec 01, 2016 4:30 pm

When finding pH, you apply sig fig rules after the decimal place. For example in question 8, there are 2 sig figs in 0.0037 M solution and in Ka=4.3x10^-7, so there should be 2 sig figs in your answer, that is after the integer value for pH.

So when you find the pH to be around 4 on the pH scale, you would then know to include 2 sig figs after the decimal point and get 4.30 (which looks like 3 sig figs even though the 2 we are interested in are behind the decimal).

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