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Chemistry - Ionic Equilibrium Question with Solution | TestHub

ChemistryIonic EquilibriumBuffer solutionHard2 minPYQ_2013

ChemistryHardsingle choice

The dissociation constant of a weak acid is $1 \times 1 0^{- 4}$ . In order to prepare a buffer solution with a pH $= 5$ , the [Salt]/ [Acid] ratio should be:NEET 2013 (Karnataka)

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Solution:

$pH = pK_{a} + lo g \frac{[ Salt ]}{Acid}$ $5 = lo g [1 \times 1 0^{- 4}] + lo g \frac{[ Salt ]}{[ Acid ]} 5 = 4 + lo g \frac{[ Salt ]}{[ Acid ]} \frac{[ Salt ]}{[ Acid ]} = 10 : 1$

Stream:NEETSubject:ChemistryTopic:Ionic EquilibriumSubtopic:Buffer solution

⏱ 2mℹ️ Source: PYQ_2013

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