Methylamine, CH NH

CHEMISTRY · Multi-part · A Level · Chemistry · Acids and bases · Acids and bases

Problem

Methylamine, CH

_3

_2

, is titrated with hydrobromic acid at constant temperature. • Sample volume:

40.0\,\text{mL}

• Sample concentration:

0.150\,\text{M}

• Titrant concentration (HBr):

0.300\,\text{M}

•

K_b

for methylamine:

4.4\times10^{-4}

Parts: (a) Determine the exact volume of HBr required to reach the equivalence point. (b) Calculate the pH at the equivalence point. (c) After the equivalence point, an additional

10.0\,\text{mL}

of the same HBr solution is added. Compute the pH of the resulting solution. (d) Explain qualitatively how the pH values obtained in parts (b) and (c) reflect the expected shape of the titration curve in the vicinity of and beyond the equivalence point.

Related theory

Equilibrium
Acid-Base Titrations
PH and ionic product
Ionic Equilibrium and pH

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