Determine the pH during the titration of 37.3 mL of 0.336 M methylamine (CH3NH2, K = 4.2×10*) by 0.336 M HI at the following points. (Assume the titration is done at 25 °C.) Note that state symbols are not shown for species in this problem. (a) Before the addition of any HI (b) After the addition of 16.2 mL of HI (c) At the titration midpoint

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The reaction of a weak base and a strong acid goes to completion; that is one of the reactants is completely reacted away. The resulting solution contains the
conjugate acid of the weak base, plus any weak base or strong acid that remains unreacted.
At each stage of the titration:
A. Determine the amount (mol) of weak acid, weak base, and strong acid present.
B. Determine the total volume of the combined solutions.
C. Determine [H3O*] or [OH], whichever predominates, using the total volume and the nature of the solution: weak base, buffer, weak acid, or strong acid.
D. Calculate pH.
Determine the pH during the titration of 37.3 mL of 0.336 M methylamine (CH3NH,, K, = 4.2x104) by 0.336 M HI at the following points. (Assume the titration
is done at 25 °C.)
Note that state symbols are not shown for species in this problem.
(a) Before the addition of any HI
(b) After the addition of 16.2 mL of HI
(c) At the titration midpoint
(d) At the equivalence point
(e) After adding 56.0 mL of HI
Transcribed Image Text:The reaction of a weak base and a strong acid goes to completion; that is one of the reactants is completely reacted away. The resulting solution contains the conjugate acid of the weak base, plus any weak base or strong acid that remains unreacted. At each stage of the titration: A. Determine the amount (mol) of weak acid, weak base, and strong acid present. B. Determine the total volume of the combined solutions. C. Determine [H3O*] or [OH], whichever predominates, using the total volume and the nature of the solution: weak base, buffer, weak acid, or strong acid. D. Calculate pH. Determine the pH during the titration of 37.3 mL of 0.336 M methylamine (CH3NH,, K, = 4.2x104) by 0.336 M HI at the following points. (Assume the titration is done at 25 °C.) Note that state symbols are not shown for species in this problem. (a) Before the addition of any HI (b) After the addition of 16.2 mL of HI (c) At the titration midpoint (d) At the equivalence point (e) After adding 56.0 mL of HI
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