SIG FIGS

[sarahtang4B]

What are the rules for sig figs when doing calculations for pH? do we always keep 2 digits after the decimal?

[Elaine Pham 2E]

For doing sig figs with pH, you start counting the sigfigs after the decimal point. For example, a pH of 1.11 has 2 sig figs or a pH of 10.000 has 3 sig figs.

[Irene Zhou 1E]

When considering sig figs for pH, begin counting the number of significant numbers after the decimal. This is because the pH of 1-14 is not based on error

[Patrick Cai 1L]

The reason for this sig fig difference in calculations related to either pH or pOH can be seen on the Chem 14B website, under the link labeled "Everything you want to know about Significant Figures". Here, the concept of how floating point number is made is shown with respect to the mantissa, or the part of the number following the decimal point. Other sig fig questions can be typically answered here.

[Brianna Brockman 1F]

It depends on what's given to you in the problem. If the probelm give you numbers with 3 sig figs, do three.

[Jaqueline Monreal 2L]

it is usually two digits rounded