pH sig figs

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Andie Jian 1D
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Joined: Fri Sep 28, 2018 12:17 am
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pH sig figs

Postby Andie Jian 1D » Fri Dec 07, 2018 11:48 am

In the textbook, it says that the number of sig figs AFTER the decimal in the pH value should equal the sig figs of the molarity. However, many of the solutions don't seem to follow this rule. Should we just base sig figs in our pH normally, or follow this decimal rule?

Rhea Churi 4K
Posts: 62
Joined: Fri Sep 28, 2018 12:28 am

Re: pH sig figs

Postby Rhea Churi 4K » Fri Dec 07, 2018 12:19 pm

My TA said to follow the decimal rule. Count sig figs after the decimal.

Megan Wong 4E
Posts: 32
Joined: Fri Sep 28, 2018 12:28 am

Re: pH sig figs

Postby Megan Wong 4E » Fri Dec 07, 2018 12:38 pm

I went to a review session and the UA said sig figs for pH pertains to numbers after the decimal.

For example, a pH of 5.435 has 3 sig figs.

Daniel Chang 3I
Posts: 33
Joined: Fri Sep 28, 2018 12:23 am

Re: pH sig figs

Postby Daniel Chang 3I » Fri Dec 07, 2018 6:15 pm

pH sig figs are different. You have to count after the decimal places and see how many to include based on the given problem

Kyither Min 2K
Posts: 60
Joined: Wed Oct 03, 2018 12:15 am

Re: pH sig figs

Postby Kyither Min 2K » Fri Dec 07, 2018 9:26 pm

On Dr.Lavelle's sig fig worksheet, he said to count the sig figs after the decimal for pH, so I suggest you go with that.

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