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Abnormal Colligative Properties

How many mole...

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How many moles of acetic acid should be added to 100 ml of 0.6 M formic acid solution such that the percentage dissociation of formic acid remains unchanged? The value of Ka for acetic acid = 1.8 × 10−5 and Ka for formic acid = 2.4 × 10−4.

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What is the conc. of acetic acid that must be added to 0.5M HCOOH solution so that the dissociation of both acids is the same? [An example of Isohydric solutions] $K_{a}$ of acetic acid $1.8 \times 10^{- 5}, K_{a}$ of formic acid = $2.4 \times 10^{- 4}$

Q. Given a solution of acetic acid. How many times of the acid concentration, acetate salt should be added to obtain a solution with

p H = 7

?

K_{a}

for dissociation of

{C H}_{3} C O O H = 1.8 \times 10^{- 5}

X \times 100

mL water must be added to

300

0.2 M

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

for the degree of dissociation of the acid to double? The value of X is ____.

[K_{a}

for acetic acid

= 1.8 \times 10^{- 5}]

Q. What volume of

0.10

M sodium formate solution should be added to

50

0.05

M formic acid to produce a buffer solution of

p H

4.0

K_{a}

for formic acid is

3.80

]

K_{a}

values of formic acid and acetic acid are respectively

1.77 \times 10^{- 4}

1.75 \times 10^{- 5}

. The ratio of the acid strength of

0.1 M

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