Dissociation constant of water at 25 degree celsius is

Asked by admin @ 20/08/2021 in Chemistry viewed by 273 People

At 25c the dissociation constant for pure water is given by ?

1.(55.5×10)^-12.(1×10)^-143.(1×10^-14)/184. None of these

Answered by admin @ 20/08/2021

Answer : The correct option is, (2) $1\times 10^{-14}$

Explanation :

Dissociation constant of pure water : It is defined as the product of the concentration of hydrogen ion and hydroxide ion.

The equilibrium dissociation reaction for water will be:

$H_2O(aq)\rightleftharpoons H^+(aq)+OH^-(aq)$

The expression for dissociation constant for water will be:

$k_w=[H^+][OH^-]$

Experimentally, at $25^oC$ temperature, the concentration of $H^+$ ion in pure water is found to be $1.0\times 10^{-7}mol/L$ .

As we know that in pure water, the concentration of hydrogen ion is equal to the concentration of hydroxide ions.

So, the value of dissociation constant of pure water will be:

$k_w=[H^+][OH^-]$

$k_w=(1.0\times 10^{-7})\times (1.0\times 10^{-7})$

$k_w=(1.0\times 10^{-14})$

Therefore, the dissociation constant of pure water is by $(1.0\times 10^{-14})$

What is the state of water at 25 degrees celsius

Asked by admin @ 04/08/2021 in Chemistry viewed by 251 persons

what is the physical state of water at 25°c ,100°c,0°c,what is the physical state of water at 25 degree Celsius 100 degree Celsius and zero degree celsius

Physical state of water at 25 degree celsius

Asked by admin @ 25/08/2021 in Chemistry viewed by 294 persons

what is the physical state of water at - a 25 degree Celsius b zero degree celsius c 100 degree Celsius

Placer deposits form when _____. heavy eroded particles settle out of moving water hot, metal-rich fluids cool below the surface magma cools in underground chambers organic matter is compressed over millions of years

Asked by maham237 @ 14/01/2021 in Biology viewed by 314 persons

Dissociation constant of water at 25 degree celsius is

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