Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
Ionic Equilibrium

NTA Abhyas 2020 · Chemistry · Ionic Equilibrium

Bromine in excess is dropped to a 0.01M SO _ 2 . All of SO _ 2 is...

Bromine in excess is dropped to a 0.01MSO20.01\text{M}{SO}_{2}. All of SO2{SO}_{2} is oxidized to H2SO4{H}_{2}{SO}_{4} and the excess Br2{Br}_{2}~is removed by flushing with gaseous N2{N}_{2}. Determine the pH\text{pH} of the resulting solution assuming Ka1{K}_{a1} of H2SO4{H}_{2}{SO}_{4} very large & Ka2=10−2.{K}_{\text{a2}} = {10}^{- 2} . Take the value of log⁡(3.24)=0.51\log ( 3 . 24 ) = 0 . 51.Bromine in excess is dropped to a 0.01M SO _ 2 . All of SO _ 2 is oxidized to H _ 2 SO _ 4 and the excess Br _ 2 ~isBromine in excess is dropped to a 0.01M SO _ 2 . All of SO _ 2 is oxidized to H _ 2 SO _ 4 and the excess Br _ 2 ~is

Correct answer

1.49

Step-by-step solution

Bromine in excess is dropped to a 0.01M SO _ 2 . All of SO _ 2 is oxidized to H _ 2 SO _ 4 and the excess Br _ 2 ~is

Bromine in excess is dropped to a 0.01M SO _ 2 . All of SO _ 2 is oxidized to H _ 2 SO _ 4 and the excess Br _ 2 ~is

HSO4−(0.01-x)(aq)⇌H+(0.03+x)(aq)+SO42+x;Ka2=10−2\mathop{{\text{HSO}}_{\text{4}}^{-}}_{\left(\text{0}\text{.01-x}\right)} \left(\text{aq}\right) ⇌ \mathop{{\text{H}}^{+}}_{\left(\text{0}\text{.03+x}\right)} \left(\text{aq}\right) + \mathop{{\text{SO}}_{\text{4}}^{\text{2+}}}_{\text{x}} ; {\text{Ka}}_{\text{2}} = {10}^{- 2}

Ka2=10−2=x(0.03+x)(0.01−x){\text{Ka}}_{2} = {10}^{- 2} = \dfrac{\text{x}\left(0.03 + \text{x}\right)}{\left(0.01 - \text{x}\right)}

x=2.36×10−3=0.00236\text{x} = 2.36 \times {10}^{- 3} = 0.00236

[H+]Total=0.03+0.00236{\left[{\text{H}}^{\text{+}}\right]}_{\text{Total}} = 0.03 + 0.00236

=0.03236=3.24+0.00236= 0.03236 = 3.24 + 0.00236

pH=−log⁡3.240×10−2\text{pH} = - \log 3.240 \times {10}^{- 2}

=2−log⁡3.24=1.49= 2 - \log 3.24 = 1.49
Practice Ionic Equilibrium on Quantrex Academy →

More from Ionic Equilibrium

Given is a concentrated solution of a weak electrolyte A_xB_y of concentration 'c' and… JEE Main 2026M_3 A_2 is a sparingly soluble salt of molar mass y g mol ^ -1 and solubility x g L ^ -1… JEE Main 2026Arrange the following resultant mixtures in increasing order of their pH values A. 10 mL… JEE Main 202620 mL of a solution of acetic acid required 28.4 mL of 0.1 M NaOH for its neutralization.… JEE Main 2026The pH of a solution obtained by mixing 5 mL of 0.1 M NH_4OH solution with 250 mL of 0.1… JEE Main 2026The first and second ionization constants of a weak dibasic acid H_2 A are 8.1 × 10^ -8… JEE Main 2026At 25°C , 20.0 mL of 0.2 M weak monoprotic acid HX is titrated against 0.2 M NaOH. The pH… JEE Main 2026The solubility product constants of Ag_2CrO_4 and AgBr are 32x and 4y respectively at 298… JEE Main 2026 Full Ionic Equilibrium list All NTA Abhyas JEE Main PYQs