Ostwald Dilution Law

Q.

If $\alpha$ is the degree of ionization, $C$ the concentration of a weak electrolyte and $K_a$ the acid ionization constant, then the correct relationship between $\alpha$, \(C\) and $K_a$ is

1. ² = √(K_a x C).

2. ² = √(C / K_a)

3. = √(K_a / C).

4. = √(C / K_a)

Q. 24. Br2+NaOH --> NaBrO3+NaBr+H2O (Basic medium) Balance the equation in ion electron method in basic medium.

Q. if ionisation constant of an acid HA at equilibrium is 1.0 * 10^-8, then calculate the value of pKa and pKb (for its conjugate base )

Q. Consider the following equilibrium constants for a triprotic acid H3PO4--- First ionisation constant is k1. Second ions. const. is k2 and likewise third ionisation constant is k3. So, which of the following orders is correct ? k1>k3>k2 k3>k2>k1 k1>k2>k3 and what is the reason for this ?

Q. the correct formula to calculate yhe hydroxyl ion concentration in aqueous sol^{n } of NH4NO3 i

Q. What will be the acidity of Magnesium hydroxide?

1. 1
2. \N
3. 2
4. 3

Q. Calculate $pH$ of $1.0MP{O}_4^{3-}$ in aqueous solution. Given $p{K}_{b}ofP{O}_4^{3-}=1.62$.

1. 13.19
2. 7
3. 6.5
4. 11.5

Q. 25. Which of the following 0.1 M solution will contain the largest conceentratiion of Hydronium ions ? A NaHCO3 B NH4Cl C HCl D NH3

Q. The ionization constant of phenol is 1.0 ×10^{-10} what is the concentration phenolate ion in 0.05 M solution of phenol? What will be its degree of ionization of the solution is also 0.01 M in sodium phenolat

Q. 14 A weak acid H3A has the three consecutive dissociation constants K1, K2 and K3 in water as 1.0 104, 1.0 108 and 1.0 1016 respectively at room temperature. A metal M forms salt MA which is sparingly soluble (solubility product 1030 ) in water. It also forms a water soluble chloride MCl3 which dissociates into M3+ and Cl ions completely in aqueous solution. For an aqueous solution of the acid H3A of concentration C ( 1 M) at room temperature, the correct statement(s) is/are: (A) The acid acts as a dibasic acid. (B) The H+ ion concentration in the solution is close to (K1C)1/2 . (C) The H+ ion concentration in the solution is (3K1 K2 K3C)1/4 . (D) On addition of excess of the soluble salt MCl3 to the acid solution, the H+ ion concentration in the solution will be 3C.

Q. the correct formula to calculate the hydroxyl ions concentration of an aqueous solution of NH4No3 is (in terms of Kw, Kb and C)

Q. The dissociation constant for a weak monobasic acid is $4\times {10}^{-10}.pH$ for this $0.01N$ weak monobasic acid is :

1. 9.7
2. 1.7
3. 3.7
4. 5.7

Q. Calculate the work expansion when 100 gram of water is electrolysed at a constant pressure of 1 ATM and temperature of 25 degree Celsius

Q. 27.At 25^° C, the dissociation constant of a base, BOH, is 10 raise to -12. The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be a)10 raised to -6 b)10 raised to -5 c)10 raised to -7

Q. in which of the following dissociation of NH₄OH will be minimum?

1. NaOH
2. ​H₂O
3. NH₄Cl
4. NaCl

Q. What is the concentration of H⁺ions and SO₄​^- present in 2 molar solution of H₂SO₄ in 2L?