Revision Acid&Base

Which one is a strong acid?

• HCl

• HF

• HClO

• HNO₂

Which one is a weak base?

• LiOH

• KOH

• CH₃CH₂NH₃

• MgO

NH₃(g) + HCl(g) ⇌ NH₄Cl(s), NH_{3 as a......}

• lewis base

• lewis acid

• bronsted acid

• bronsted base

Which one is a lewis acid?

• H₂O

• BF₃

• NH₃

• OH^-

Which one is not a lewis base?

• cyanide ion

• water

• hydroxide ion

• aluminum trichloride

CH₃COOH(aq) + H₂O(l) ⇌ H₃O⁺(aq) + CH₃COO^-(aq)

conjugate for ethanoate ion is

• water

• acetic acid

• hydrogen ion

• proton

Strong Brønsted acids have-------- conjugate bases

• strong

• weak

CH₃COOH(aq) + H₂O(l) ⇌ H₃O⁺(aq) + CH₃COO^-(aq)

conjugate for ethanoate ion is

• water

• acetic acid

• hydrogen ion

• proton

In a solution when [H⁺] < 1.0 x 10^–7 M, the solution ......

• has a pH of more than 7

• has the [OH^-] less than 1.0 x 10^–7 M

• has a pH of 7

• is an acidic solution

Calculate the pH for 5×10⁻⁵ M of 0.5 L HCl.

• 0.3

• 4.6

• 4.3

• 3.5