Chemical Equilibria

Question

8g of potassium chromate is dissolved in acid to make 100cm^3 solution. A dynamic equilibrium occurs,

2CrO4^2-(aq) + 2H^+(aq)<-> Cr2O7^2-(aq) + H2O(l)

(i) What is the Kc expression for above eqiulibrium

(ii)calculate pH at which only 1/5 of original amount of chromate ions remain.

Robert john · Accepted Answer

You can take help of following formula to solve the numerical for the value of Kc:

$K_c=\frac{{[S]} ^\sigma {[T]}^\tau ... } {{[A]}^\alpha {[B]}^\beta ...}$

Value of Kc will depend on the ionic strength. All equilibrium constants depend on temperature and pressure (or volume).

There are all sorts of calculations you might be expected to do which are centred around equilibrium constants. You might be expected to calculate a value for K_c including its units (which vary from case to case). Alternatively you might have to calculate equilibrium concentrations from a given value of K_c and given starting concentrations.

Physical Chemistry> Chemical Equilibria...

8g of potassium chromate is dissolved in acid to make 100cm^3 solution. A dynamic equilibrium occurs,

2CrO4^2-(aq) + 2H^+(aq)<-> Cr2O7^2-(aq) + H2O(l)

(i) What is the Kc expression for above eqiulibrium

(ii)calculate pH at which only 1/5 of original amount of chromate ions remain.

Mohamed Faisal , 15 Years ago

Robert john

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Physical Chemistry> Chemical Equilibria...

8g of potassium chromate is dissolved in acid to make 100cm^3 solution. A dynamic equilibrium occurs, 2CrO4^2-(aq) + 2H^+(aq)<-> Cr2O7^2-(aq) + H2O(l) (i) What is the Kc expression for above eqiulibrium (ii)calculate pH at which only 1/5 of original amount of chromate ions remain.

Mohamed Faisal , 15 Years ago

Robert john

LIVE ONLINE CLASSES

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2CrO4^2-(aq) + 2H^+(aq)<-> Cr2O7^2-(aq) + H2O(l)

(i) What is the Kc expression for above eqiulibrium

(ii)calculate pH at which only 1/5 of original amount of chromate ions remain.

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