Question

A) A 27.0 mL sample of 0.348 M ammonia, NH₃, is titrated with 0.330 M hydrobromic acid.
After adding 44.7 mL of hydrobromic acid, the pH is ________________ .
Use the Tables link in the References for any equilibrium constants that are required.

B) A 22.4 mL sample of 0.293 M triethylamine, (C₂H₅)₃N, is titrated with 0.291 M nitric acid.
At the titration midpoint, the pH is__________________

Fundamental Constants
Name	Symbol	Value
Avogadro's Number	N	6.022 × 1023 mol-1
Boltzmann's Constant	kb	1.381 × 10-23 J K-1
Electron Charge	e	1.602 × 10-19 C
Faraday's Constant	F = Ne	9.649 × 104 C mol electrons-1
Ideal Gas Constant	R = Nkb	8.314 J mol-1 K-1 0.08206 L atm mol-1 K-1 8.314 L kPa mol-1 K-1
Planck's Constant	h	6.626 × 10-34 J s
Rydberg Constant	R	1.097 × 107 m-1
Speed of Light (in vacuum)	c	2.998 × 108 m s-1
Standard Acceleration (due to gravity)	g	9.807m s-2
Universal Gravitational Constant	G	6.674 × 10-11 m3 kg-1 s-2
Vacuum Permittivity	εo	8.854 × 10-12 C2 J-1 m-1
Mass of Electron	me	9.109 × 10-31 kg
Mass of Neutron	mn	1.675 × 10-27 kg
Mass of Proton	mp	1.673 × 10-27 kg

Answer 1