Ionic Equilibria & pH: JEE Questions & Solutions

The first and second ionization constants of H2X are 2.5 10^-8 and 1.0 10^-13 respectively. The concentration of X^2- in 0.1 M H2X solution…

Molar conductivity of a weak acid HQ of concentration 0.18 M was found to be 130 of the molar conductivity of another weak acid HZ with…

Consider the dissociation equilibrium of the following weak acid: HA H^+(aq) + A^-(aq) If the pKa of the acid is 4, then the pH of a 10 mM…

If 1 mM solution of ethylamine produces pH = 9, then the ionization constant (Kb) of ethylamine is 10^-x. The value of x is (nearest…

pH of water is 7 at 25^ C. If water is heated to 80^ C, its pH will:

A weak acid HA has degree of dissociation x. Which option gives the correct expression of pH - pKa?

The pH of a 0.01 M weak acid HX ( K a=4 10^-10) is found to be 5. Now the acid solution is diluted with excess of water so that the pH of…

x mg of Mg(OH)2 (molar mass = 58) is required to be dissolved in 1.0 L of water to produce a pH of 10.0 at 298 K. The value of x is mg.…

An aqueous solution of HCl with pH 1.0 is diluted by adding equal volume of water (ignoring dissociation of water). The pH of HCl solution…

When the hydrogen ion concentration [H^+] changes by a factor of 1000, the value of pH of the solution:

Millimoles of calcium hydroxide required to produce 100 mL of the aqueous solution of pH = 12 is x 10^-1. The value of x is (Nearest…

600 mL of 0.01 M HCl is mixed with 400 mL of 0.01 M of H2 SO4. The pH of the mixture is 10^-2. (Nearest integer) Given: 2 = 0.30, 3 = 0.48,…

Incorrect statement for the use of indicators in acid-base titration:

The titration curve of weak acid vs. strong base with phenolphthalein as indicator is shown below: The K phenolphthalein = 4 10^-10 and log…

Which of the following statement(s) is/are correct? (A) The pH of 1 10^-8 M HCl solution is 8. (B) The conjugate base of H2PO4^- is…