Are all pH calculations done to 2 decimal places or do we use sig figs in pH calculations? [ENDORSED]

[Henri_de_Guzman_3L]

For example 6B.5c in the 7th edition textbook asks us to calculate the pH for 0.0092 M Ba(OH)2. This is 2 sig figs but the answer in the back gives 12.96. Should the answer instead be 13?

[anthony_trieu2L]

For pH calculations, the sig figs are only accounted for after the decimal point. In this case, since there are two sig figs in 0.0092 M Ba(OH)2, the final answer should present two digits after the decimal point. Thus, 12.96 is correct.

[RandallNeeDis3K]

pH calculations only follow sig figs after the decimal point! so two sig figs after the decimal point makes sense.