Question 79065
{{{PH = -log(x)}}}
Find x if PH = 3.
{{{3 = -log(x)}}} Multiply both sides by -1.
{{{-3 = log(x)}}} Rewrite in exponential form: If{{{Log[b](x) = y}}} then {{{y^b = x}}}, so...
{{{10^(-3) = x}}} or
{{{x = 0.001}}}

Answer:
The hydrogen concentration would be 0.001 moles per litre.