Significant Figures for pH

[Eugenia Kwon 3O]

When calculating pH, is it right that we always assume 3 significant figures for the pH?

[Samuel_Vydro_1I]

the sig figs for pH is the total like as in the 12 in 12.34. that is always unaffected. Starting with the decimal point, it is the number of sig figs in the value that was log'ed. so as log(2.73 ×10–5) = –4.564. The 2.73 is three sig figs for there must be three sig figs after the decimal point.