Untitled.notebook
May 21, 2014
Ascorbic acid is the chemical ingredient of Vitamin C. A student prepares a 0.20 mol/L aqueous solution of ascorbic acid, measures its pH, and finds it to be 2.40. Based on this evidence, what is the Ka for ascorbic acid?
1
Untitled.notebook
May 21, 2014
Benzoic acid, HC6H5CO2, is an organic acid whose sodium salt, NaC6H5CO2, has long been used as a safe food addive to protect beverages and many foods against harmful yeasts and bacteria. The acid is monoproc. Write the equaon for its Ka. If the Ka of 0.24M soluon of benzoic acid is 6.4 x 10 ‐5, determine the pH of the soluon.
2
Untitled.notebook
May 21, 2014
Ka vs Kb
3
Untitled.notebook
May 21, 2014
What is the pH of 0.070M ethanolamine, HOC2H5NH2? (Kb = 3.2 x 10­5)
4
Untitled.notebook
May 21, 2014
Hydrazine, N2H4, has been used as a rocket fuel. Like ammonia, it is a Bronsted base. A 0.15 M soluon has a pH of 10.70. What is the Kb for hydrazine?
5
Untitled.notebook
May 21, 2014
Codeine (C18H21NO3), is a narcotic pain reliever that forms a salt with HCl. What is the pH of a 0.05M codeine hydrogen chloride solution? (Kb = 1.6 x 10­6)
6