Analytical chemistry Flashcards
A solution is basic if:
a. [OH-] > 0
b. [OH-] = 1x10-7M
c. [OH-] > [H+]
d. [OH-] > 1x10-7M
C
Water at room temperature usually has a slightly acidic pH. This is largely attributed to what compound(s)?
a. Sulfuric acid
b. Dissolved metals
c. Carbonic acid
d. Nitric acid
C
When benzoic acid dissolves in water, it partially reacts with water and ionizes to form benzoate and hydronium ions. In this reaction, what is the conjugate acid?
a. Benzoate ions
b. Hydronium ions
c. Water
d. Benzoic acid
B
Define a salt in terms of acid and base.
a. A salt is a compound that follows Le Chatelier’s Principle in reactions with
other compounds.
b. All of these
c. A salt is a compound formed when the nucleus of a hydrogen tom enters a quantity of water.
d. A salt is a compound (other than water) produced by the reaction of an acid and a base.
D
When a can of soda is opened and CO2 is released to the atmosphere, what is the resultant pH of the soda?
a. Decreases
b. Increases
c. The same
d. Allthese
B
Which of the following pairs will form a buffer solution in the course of a titration?
a. Nitric acid, sodium hydroxide
b. Sulfuric acid, potassium hydroxide
c. Acetic acid, sodium hydroxide
d. Hydrochloric acid, potassium hydroxide
C
Buffer capacity is maximum when:
a. pH = 0.5pKa
b. pH = pKa
c. pH = 2pKa
d. pH = 0.1pKa
B
Which of the following acids would be most suitable for preparing a buffer of pH 3.1?
a. Hydrogen peroxide, pKa = 11.65
b. Propanoic acid, pKa = 4.874
c. Cyanoacetic acid, pKa = 2.472
d. Sulfanilic acid, pKa = 3.232
D
The distance of the Earth to the most remote normal galaxy is calculated to be:
a. 2x1022m
b. 1.4x1026m
c. 4x1016m
d. 9x1025m
A
