Chemistry - Ionic Equilibrium Question with Solution | TestHub

ChemistryIonic EquilibriumMiscellaneous/MixedEasy2 minPYQ_2020

ChemistryEasysingle choice

A salt is formed when a weak acid of dissociation constant $1 0^{- 4}$ and weak base of dissociation constant $1 0^{- 5}$ are mixed. The pH and degree of hydrolysis of salt solution are

Options:

Answer:

Solution:

$K_{a} = 1 0^{- 4}; p K_{a} = 4$

$K_{b} = 1 0^{- 5}; p K_{b} = 5$

$h = \sqrt{K_{h}}$

$= \sqrt{\frac{K_{w}}{K_{a} \times K_{b}}}$

$= \sqrt{\frac{1 0^{- 14}}{1 0^{- 5} \times 1 0^{- 5}}} = \sqrt{10 \times 1 0^{- 6}}$

$= 3 \times 1 0^{- 3}$

% Hydrolysis $= h \times 100 = 3 \times 0.001 \times 100 = 0.3 %$

$p H = 7 + \frac{1}{2} p K_{a} - \frac{1}{2} p K_{b} = 7 + 2 - 2.5 = 6.5$

Stream:NTA_ABHYASSubject:ChemistryTopic:Ionic EquilibriumSubtopic:Miscellaneous/Mixed

⏱ 2mℹ️ Source: PYQ_2020

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