sigfigs for acids/bases

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005199302
Posts: 108
Joined: Fri Sep 28, 2018 12:15 am

sigfigs for acids/bases

Postby 005199302 » Thu Jan 17, 2019 9:44 pm

I know Dr. Lavelle mentioned this in class, but what are the sigfig rules for pH/pOH? Also, is there any situation where we disregard this rule?

Mindy Kim 4C
Posts: 65
Joined: Fri Sep 28, 2018 12:25 am

Re: signings for acids/bases

Postby Mindy Kim 4C » Thu Jan 17, 2019 9:45 pm

I believe Dr. Lavelle said in lecture that however many sigfigs are in the molarity of H+ or OH- is how many decimal places there should be in your pH or pOH value.

Jocelyne Milke 1G
Posts: 73
Joined: Fri Sep 28, 2018 12:25 am

Re: sigfigs for acids/bases

Postby Jocelyne Milke 1G » Thu Jan 17, 2019 9:48 pm

also sig figs for pH count after the decimal.

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

Re: sigfigs for acids/bases

Postby Kyither Min 2K » Fri Jan 18, 2019 11:08 am

For pH, the significant figures matter AFTER the decimal. So if the concentration of Hydronium ions is .0136 mol/L , 3 sig figs. The pH would be 1.866, 3 sig figs after the decimal.


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