Practice: Consider the titration of 30.0 mL of 0.100 M HC2H3O2 with 0.100 M NaNH2. Which volume of NaNH2 would take place within the buffer region?
a) 30.0 mL b) 50.0 mL c) 10.0 mL d) 100.0 mL e) 1.5 L
Concept #1: Key Features of Weak Titrate-Strong Titrant Curve
Buffer Region exists between a weak titrate and strong titrant. This is a region where pH gradually changes.
Example #1: Consider the titration of 55.0 mL of 0.120 M HCN with 0.160 M LiOH. Calculate the volume needed to reach the half equivalence point.
Practice: Consider the titration of 30.0 mL of 0.100 M HC2H3O2 with 0.100 M NaNH2. Which volume of NaNH2 would take place within the buffer region?
a) 30.0 mL b) 50.0 mL c) 10.0 mL d) 100.0 mL e) 1.5 L
Concept #2: Buffer Region
In this titration curve, weak acid was titrated with a strong base, creating a buffer region.
Concept #3: Buffer Region
In this titration curve, weak base was titrated with a strong acid, creating a buffer region.
Example #2: At the half equivalence point the [WA] = [CB]. Consider the titration of 100.0 mL of 0.200 M of a weak monoprotic acid with 50.0 mL of 0.200 M NaOH. Determine Ka value of the weak acid if the pH is 4.18.
Practice: In titration of NH3 and HCl, what is the predominant species beyond the equivalence point?
a) NH3 b) HCl c) CH3NH2 d) Cl–
