Question 944226
Better notation,  pH=-log([H^+]), about the best to be done this way because the rendering will destroy part of it.  A more convenient way to express this could be pH=-log(H), and we just need to know we are using base ten.


-log(H)=2.9

log(H)=-2.9

The meaning is, {{{HydroniumMolarity=10^(-2.9)}}}


Near 0.00126 M.  You want to take this to two significant figures.