Chapter 17 Principles of Chemical Reactivity: Other Aspects of Aqueous Equilibria - Study Questions - Page 677a: 30

a) Equivalence: $0.175\ M\times 25.67\ mL = c_{aniline}\times 25.0\ mL$ $c=0.18\ M$ b) Formed aniline cation: $(0.175\ M\times 25.67\ mL)/(25+25.67)=0.089\ M$ Equilibrium: $K_b=4.0\cdot10^{-10}$ $K_w/K_b=x\cdot x/(0.089-x)$ $x=1.48\cdot10^{-3}\ M=[H_3O^+],\ [C_6H_5NH_3^+]=0.0875\ M$ $[OH^-]=6.76\cdot10^{-12}\ M$ c) $pH=2.83$

a) Equivalence: $0.175\ M\times 25.67\ mL = c_{aniline}\times 25.0\ mL$ $c=0.18\ M$ b) Formed aniline cation: $(0.175\ M\times 25.67\ mL)/(25+25.67)=0.089\ M$ Equilibrium: $K_b=4.0\cdot10^{-10}$ $K_w/K_b=x\cdot x/(0.089-x)$ $x=1.48\cdot10^{-3}\ M=[H_3O^+],\ [C_6H_5NH_3^+]=0.0875\ M$ $[OH^-]=6.76\cdot10^{-12}\ M$ c) $pH=2.83$