Question

The equivalent conductance of decinormal solution of acetic acid at 298k is 80 and infinite dilution

Answer 1

Answer:

The equivalenet conductivites of acetic acid at

at the concentration of

and

are

and

respectively.

Answer 2

Answer: The answer will be 1.3% and 12.5 %

Explanation:

Did you mean

The equivalent conductance of decinormal acetic acid at 298k at the concentration of 0.1 M and 0.001 M are 5.20 and 49.2 S $cm^{2}$$eq^{-1}$ respectively. Calculate the degree of dissociation of acetic acid at these concentrations. Given that  λ^∞ ($CH_{3}COOH^{-}$) are 349.8 and 40.9 $ohm^{-1} cm^{2}mol^{-1}$ respectively.

As we know degree of dissociation can be calculated by the formula ,

$\alpha =$ λeq/λeq^∞

λ^∞($CH_{3}COOH^{-}$) = (40.9+ 349.8) $ohm^{-1} cm^{2}mol^{-1}$

λ^∞($CH_{3}COOH^{-}$) = 390.7 $ohm^{-1} cm^{2}mol^{-1}$

Lets take the question into two cases,

CASE 1 : 0.1 M concentration

$\alpha =$ λeq/λeq^∞

Putting the values in the given formula

$\alpha _{1}$$= \frac{5.2}{390.7}$

$\alpha _{1}$$= 0.013$ or $1.3%$%

Answer ) The degree of dissociation of acetic acid at 298k and 0.1 M concentration is 1.3 %

CASE 2 : 0.001 M concentration

$\alpha =$ λeq/λeq^∞

Putting the values in the given formula

$\alpha =\frac{49.2}{390.7}$

$\alpha = 0.125$ or $12.5$%

ANSWER ) The degree of dissociation of acetic acid at 298k and 0.001 M concentration is 12.5%