Which of the following is an amphoteric substance?
a) HCl
b) NaOH
c) Al(OH)3Al(OH)_3Al(OH)3
d) Ca(OH)2Ca(OH)_2Ca(OH)2
Answer: c
The acid dissociation constant KaK_aKa for acetic acid is 1.8×10−51.8 \times 10^{-5}1.8×10−5. What does this indicate about acetic acid?
a) It is a strong acid
b) It is a weak acid
c) It is a neutral acid
d) It is a strong base
Answer: b
Which of the following salts will hydrolyze in water to produce a basic solution?
a) NaCl
b) NH4ClNH_4ClNH4Cl
c) CH3COONaCH_3COONaCH3COONa
d) KNO3KNO_3KNO3
Answer: c
What is the pH of a 0.01 M solution of HCl?
a) 2
b) 4
c) 7
d) 12
Answer: a
Which of the following compounds is a Lewis acid?
a) NH3NH_3NH3
b) H2OH_2OH2O
c) BF3BF_3BF3
d) CH4CH_4CH4
Answer: c
The pH of a buffer solution depends on:
a) The concentration of acid and base
b) The volume of the solution
c) The temperature of the solution
d) All of the above
Answer: d
In the reaction NH3+H2O⇌NH4++OH−NH_3 + H_2O \rightleftharpoons NH_4^+ + OH^-NH3+H2O⇌NH4++OH−, NH3NH_3NH3 acts as:
a) An acid
b) A base
c) A salt
d) A solvent
Answer: b
What is the conjugate acid of HCO3−HCO_3^-HCO3−?
a) H2CO3H_2CO_3H2CO3
b) CO32−CO_3^{2-}CO32−
c) H2OH_2OH2O
d) OH−OH^-OH−
Answer: a
The pH of a 0.1 M acetic acid solution is approximately:
a) 1
b) 3
c) 7
d) 10
Answer: b
Which of the following statements is true about the pH scale?
a) A pH of 7 is neutral, pH < 7 is acidic, and pH > 7 is basic
b) A pH of 7 is acidic, pH < 7 is basic, and pH > 7 is neutral
c) A pH of 7 is basic, pH < 7 is neutral, and pH > 7 is acidic
d) None of the above
Answer: a