Chemistry, asked by Blackqueen, 1 year ago

Answer this question please!! I need help!9th one

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Blackqueen: Heyy may ask one thing?

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Blackqueen: Almost all of my questions,are answered by u!

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Blackqueen: i mean,are u just answeing my questions or others too?

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Answers

Answered by JinKazama1

Question :
At 298 K, molar conductivities at infinite dilution of NH4Cl, NaOH and NaCl are
129.8, 217.4 and 108.9 ohm-1 cm2respectively. If molar conductivity ofcentinormal solution of NH4OH is 9.33 ohm-1 cm2.
Calculate equilibrium constant of (NH4OH).

Final Answer :
Equilibrium Constant of (NH4OH) = 1.6 * 10^(-5)units .
Ans.

Steps :
1) As shown in pic,

By Kohlrauchs law, Molar conductivity of Ammonium Hydroxide at infinite dilution will be
238.3ohm^-1cm^2mol^-1.

2) We will calculate degree of ionisation,
α = Molar Conductivity at 0.01N/ Molar Conductivity at infinite dilution.
= 9.33/238.3 = 0.0392

3) From Ostwald's dilution law , Ionisation constant of weak base is shown in pic. of concentration 0.01.N.

From, here we calculate.
K(b) of weak base of = 1.6 * 10^-5 units.
NH4OH.

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