Chapter 4 Stoichiometry: Quantitative Information about Chemical Reactions - Study Questions - Page 179i: 109

See answer below.

a) $pH=-log(0.105)=0.979$ b) $[H_3O^+]=10^{-2.56}=2.75\ mmol$, acidic c) $[H_3O^+]=10^{-9.67}=2.14\times10^{-10}\ mol$, basic d)$[H_3O^+]=(10.0\ mL\times2.56\ M)/250.\ mL=0.102\ M$ $pH=-log(0.102)=0.990$