Question

Which of the following mixtures would result in buffered solutions when 1.0 L of each of the two solutions are mixed? (Select all that apply.)

0.1 M LiOH and 0.2 M C₂H₅NH₃Cl0.1 M RbOH and 0.1 M NH₄Cl0.2 M LiOH and 0.1 M CH₃NH₃Cl0.1 M LiOH and 0.2 M C₂H₅NH₂

Answer 1

if solution contain both weak base and its salt then only it can act as buffer .

only first case this condition follows so first solution only act as buffer.

for first solution

C2H5NH3Cl + LiOH --------------> C2H5NH2 + LiCl + H2O

so resulting solution contain both weak base (C2H5NH2) and its salt (C2H5NH3Cl) .

so this mixture act as basic buffer.