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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.

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.

Grade:11

1 Answers

Robert john
17 Points
10 years ago

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 Kc including its units (which vary from case to case). Alternatively you might have to calculate equilibrium concentrations from a given value of Kc and given starting concentrations.

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