Caprytic acid, also called octanoic acid, is an
8-carbon fatty acid that is used as a sanitizer on
dairy equipment that comes in contact with milk.
The acid has a molar mass of 144.21 g/mol. An
aqueous solution of the sanitizer containing
12.25 g/L has a pH of 2.98. What is the
acid-dissociation constant, Ka, for caprytic acid?
48. Citric acid, C6H8O7(aq), is used to add a sour taste
to foods and soft drinks. It is prepared in a solution
with a concentration of 0.52 mol/L, and has a pH
of 1.72. Calculate the acid-dissociation constant for
citric acid. What percentage of citric acid molecules
ionizes in the solution?
49. Creatine is a naturally occurring organic acid that
helps supply energy to all cells in the body, with
particular emphasis on muscle cells. It has a molar
mass of 131 g/mol. An aqueous solution containing
2.68 g/L has a pH of 2.23. What percentage of
creatine molecules ionizes in the solution?
50. Uracil is one of the four nucleotide monomers that
make up the nucleic acid RNA. It was originally
isolated in 1900, by the hydrolysis of yeast nuclein
found in bovine thymus and spleen. Uracil has
a molar mass of 112 g/mol. A biologist prepares
a solution of the acid by dissolving 1.24 g of the
compound in 1.0 L of solution. The pH of the
solution is 5.71. Calculate the acid-dissociation
constant, Ka, for uracil.
Practice Problems
512 MHR
1 answer