weak acid and weak bases (qualitative)

HA, a weak acid, is partially dissociated in water into hydrogen ions and A^- . Which of the following equation represents dissociation of HA, a weak acid, in water?

• HA(aq) ⇌ H^- (aq) + A⁺ (aq)

• H^- (aq) + A⁺ (aq) ⇌ HA(aq)

• HA(aq) ⇌ H⁺ (aq) + A^- (aq)

• H⁺ (aq) + A^- (aq) ⇌ HA(aq)

B, a weak base, can react with water in equilibrium into hydroxide ions and BH⁺ . Which of the following equation represents dissociation of B, a weak base, in water?

• B(aq) + H₂O(l) ⇌ BH⁺(aq) + OH^- (aq)

• B(aq) + H₂O(l) ⇌ BH⁺(aq) + H₃O⁺ (aq)

• B(aq) + H₃O⁺(aq) ⇌ BH⁺(aq) + H₂O(l)

• B(aq) + OH^-(aq) ⇌ BH⁺(aq) + O^2-(aq)

For this reaction :

HA(aq) + H₂O(l) ⇌ H₃O⁺(aq) + A^-(aq)

Which one can act as an acid ?

• HA(aq) and A^-(aq)

• H₂O(l) and H₃O⁺(aq)

• HA(aq) and H₃O⁺(aq)

• H₂O(l) and A^-(aq)

For this reaction :

HA(aq) + H₂O(l) ⇌ H₃O⁺(aq) + A^-(aq)

Which one is base-conjugate acid pair?

• HA(aq) and H₃O⁺(aq)

• HA(aq) and A^-(aq)

• H₂O(l) and A^-(aq)

• H₂O(l) and H₃O⁺(aq)

For this reaction :

B(aq) + H₂O(l) ⇌ BH⁺(aq) + OH^-(aq)

Which one can act as an acid ?

• B(aq) and BH⁺(aq)

• B(aq) and BH⁺(aq)

• H₂O(l) and BH⁺(aq)

• H₂O(l) and OH^-(aq)

For this reaction :

B(aq) + H₂O(l) ⇌ BH⁺(aq) + OH^-(aq)

Which one is base-conjugated acid pair ?

• B(aq) and BH⁺(aq)

• B(aq) and OH^-(aq)

• H₂O(l) and BH⁺(aq)

• H₂O(l) and OH^-(aq)

dissociation of weak acid, HA, is represented by following equation :

HA(aq) + H₂O(l) ⇌ H₃O⁺(aq) + A^-(aq)

The equilibrium constant for this reaction is represented by K_a . Which of the following equation represents expression of equilibrium constant, K_a?

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• 
• 
• 

the following equation represents the equilibrium reaction between weak base, B, with water :

B(aq) + H₂O(l) ⇌ BH⁺(aq) + OH^-(aq)

The equilibrium constant for this reaction is represented by K_b . Which of the following equation represents expression of equilibrium constant, K_b?

• 
• 
• 
• 

Which one IS TRUE about dissociation of weak acid in water ?

1.[H⁺] ions > [OH^-] ions in weak acid-containing solution

2.The numerical value of Equilibrium constant of dissociation of weak acid, K_a, increase as the temperature decrease

3.It makes light bulb glow very bright

4.pOH > 7 in weak acid-containing solution

• 1, 2, 3 and 4

• 1,2, and 3

• 1,2, and 4

• 2,3 and 4

• 1,3 and 4

Which one IS TRUE about dissociation of weak base in water ?

1.[H⁺] ions = [OH^-] ions in weak base-containing solution

2.The numerical value of Equilibrium constant of dissociation of weak base, K_b, decrease as the temperature decrease

3.Weak base are less dissociated in solution as the amount of concentration of common-ion OH^- in solution increase

4.pH > 7 in weak base-containing solution

• 1, 2, 3, and 4

• 1, 2, and 3

• 2, 3, and 4

• 2 and 4

• 2 and 3