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Directive Influence of Substituents

27. The entha...

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27. The enthalpy of neutralisation of four acids HA, HB, HC and HD with NaOH are 13, 12, 11,10 kcal/mol. Which salt has maximum degree of hydrolysis ? (1) 1M NaA (2) 1M NaB (3) 1M NaC (4) 1M NaD

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Q. The enthalpy of neutralization of four acids

H A

H B

H C

H D

N a O H

- 13, - 12, - 11

- 10

Kcal/mol. Which salt has maximum degree of hydrolysis?

Q. The enthalpies of neutralisation of a strong acid

H A

H B

N a O H

- 13.7

- 12.7

k c a l / e q

. When one equivalent of

N a O H

is added to a mixture containing

1

H A

H B

; the enthalpy change was

- 13.5 k c a l

. In what ratio is the base distributed between

H A

H B

Q. The enthalpies of neutralisation of a strong acid

H A

H B

by NaOH are -13.68 kcal/equivalent and -2.9 kcal/equivalent respectively. If one equivalent of

H A

and one equivalent of

H B

are mixed with one equivalent of NaOH, the enthalpy change was found to be - 6.9 kcal/equivalent calculate the distribution of NaOH to neutralise

H A

H B

.

H A + N a O H \to N a A + H_{2} O Δ H = - 12 k c a l

H B + N a O H \to N a B + H_{2} O Δ H = - 11 k c a l

then equimolar solution of which acid has higher

p H

?

Q. The hydrolysis constant of the salts NaA and NaB [of two weak acids HA and HB] are

10^{- 8}

10^{- 10}

respectively. If the dissociation constant

K_{a}

of weak acid HC is

10^{- 5}

, then decreasing order of the acid strength would be -

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