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Lewis Theory

Molarity of a...

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Molarity of a mixture of acid and base

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Q. Assertion :Mixture of

{C H}_{3} C O O H

{C H}_{3} C O O {N H}_{4}

is an example of acidic buffer. Reason: Acidic buffer contains equimolar mixture of a weak acid and its salt with weak base.

p H

of a mono-acidic base is 12.6990. The molarity of the base is:

Q. Assertion :Mixture of

{C H}_{3} C O O H

{C H}_{3} C O O {N H}_{4}

is not a buffer solution. Reason: Acid buffer contains the mixture of weak acid and its salt with strong base.

V_{1} m l

of x molar hydochloric acid is mixed with

V_{2} m l

of y molar sodium hydroxide. Arrange the following steps in correct sequence for calculation of pH of the mixture. (y > x and

V_{1} > V_{2})

(a) Calculation of the number of equivalent of acid and base.
(b) Calculation of the total volume of mixture.
(c) Calculation of the normality of acid and base.
(d) Calculation of the net

O H^{-}

ion concentration.
(e) Taking the negative logarithm of

H^{+}

ion concentration.
(f) Dividing

K_{w}

O H^{-}

ion concentration.

Assertion: A mixture of

C H_{3} C O O H

C H_{3} C O O N H_{4}

is not a buffer solution.

Reason: An acidic buffer contains the mixture of a weak acid and its salt with a strong base.

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