List of top Physical Chemistry Questions on Chemical equilibria

A 1.0 L solution is prepared by dissolving 2.0 g of benzoic acid and 4.0 g of sodium benzoate in water. The pH of the resulting solution is _______. (rounded off to one decimal place)
Given: Molar mass of benzoic acid is 122 g mol⁻¹ 
Molar mass of sodium benzoate is 144 g mol⁻¹ 
p𝐾_a of benzoic acid is 4.2

0.1 M aqueous solution of a weak monobasic acid has pH 2.0. The pKa of the monobasic acid is _______. (rounded off to one decimal place)

Consider the exothermic chemical reaction O₂(𝑔)+2H₂(𝑔) ⇌ 2H₂O(𝑔) at equilibrium in a closed container. The correct statement(s) is/are

The ratio of osmotic pressures of aqueous solutions of 0.01 M BaCl₂ to 0.005 M NaCl is
[Given: Both compounds dissociate completely in water]

The isoelectric point of glutamic acid is ______.

(round off to two decimal places)

The following diagram is obtained in a pH-metric titration of a weak dibasic acid (H₂A) with a strong base. The point that best represents [HA⁻]=[A ⁻² ] is

The volume of water (in mL) required to be added to a 100 mL solution (aq. 0.1 M) of a weak acid (HA) at 25 °C to double its degree of dissociation is
[Given: K_a of HA at 25 °C=1.8 x10⁻⁵ ]

The pH of an aqueous buffer prepared using CH3COOH and CH3COO Na⁺ is 4.80.
The quantity \(\frac{[CH_3COO^-]-[CH_3COOH]}{[CH_3COOH]}\) is _____. (round off to three decimal places)
[Given: pK_a of CH₃COOH in water is 4.75]