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Equilibrium

Question
CBSEENCH11008424
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A Weak acid, HA has a Ka of 1.00 x 10-5. If 0.100 mole of this percentage of acid dissociated at equilibrium is closest to:

  • 99.0%

  • 1.00%

  • 99.9 %

  • 0.100%

Solution

B.

1.00%

HA space leftwards harpoon over rightwards harpoon space straight H to the power of plus space plus space straight A to the power of minus straight K subscript straight a space space equals space fraction numerator left square bracket straight H to the power of plus right square bracket left square bracket straight A to the power of minus right square bracket over denominator left square bracket HA right square bracket end fraction space equals space fraction numerator left square bracket straight H to the power of plus right square bracket over denominator left square bracket HA right square bracket end fraction left square bracket straight H to the power of plus right square bracket space equals space square root of straight K subscript straight a left square bracket HA right square bracket end root space equals space square root of 1 space straight x space 10 to the power of negative 5 end exponent space 0.1 end root space equals square root of 1 space straight x 10 to the power of negative 6 end exponent end root space equals space 1 space straight x space 10 to the power of negative 3 end exponent straight alpha space equals space fraction numerator actual space ionization over denominator molar space concentration end fraction space equals space fraction numerator 10 to the power of negative 3 end exponent over denominator 0.1 end fraction space equals space 10 to the power of negative 2 end exponent percent sign space of space acid space dissociated space space equals space 10 to the power of negative 2 end exponent space straight x space 100 space equals space 1 percent sign

Some More Questions From Equilibrium Chapter

Which measurable property becomes constant in water vapour equilibrium?

Give an example from daily life in which there is gas solution equilibrium?

A crystal of common salt of a given mass is kept in its aqueous solution. After 24 hours, its mass remains the same. Is the crystal in equilibrium with the solution?

What is the role of forward and backward reactions at equilibrium of a reversible reaction?

What is a forward reaction?

What condition favours a reversible reaction?

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