List of top Physical Chemistry Questions on Chemical equilibria

For the dissociation reaction,
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]
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 
p𝐾a 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 isoelectric point of glutamic acid is ______.
The isoelectric
(round off to two decimal places)
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: Ka of HA at 25 °C=1.8 x10−5 ]
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
pH-metric titration of a weak dibasic acid
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: pKa of CH3COOH in water is 4.75]

The solubility of \( \text{PbI}_2 \) in 0.10 M KI(aq) is ........... \( \times 10^{-7} \) M (rounded up to two decimal places). 
\(\text{[The solubility product, \( K_{\text{sp}} = 7.1 \times 10^{-9} \)]}\)