EASY
Earn 100

The conjugate base of water is 

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Important Questions on Equilibrium

HARD
For the following Assertion and Reason, the correct option is:
Assertion: The pH of water increases with increase in temperature.
Reason: The dissociation of water into H+ and OH- is an exothermic reaction.
MEDIUM
The pH of an aqueous solution of 10-8MHCl is
EASY

Which of the following equations give ionic product of water?

(i) NH3aq+H2ONH4aq++OHaq-

(ii) NH4aq++H2OH3O++NH3aq

(iii) NH2aq-+H2ONH3aq+OH-

(iv) NH3aq+OHaq-NH2aq-+H2O

EASY
The pH of pure water at 80°C is
HARD
At 298 K, the ratio of dissociated water to that of undissociated water is [Assume pure water]
EASY
The pH of pure water at 90C will be
MEDIUM
How many litres of water must be added to 1 litre of aqueous solution of HCl with a pH of 1 to create an aqueous solution with pH of 2?
MEDIUM
How does Kw vary with temperature and why?
EASY
By applying the law of mass action, the equilibrium constant, K for the reaction

HA+H2OH3O++A-, is given as
MEDIUM
What do you understand by the term ‘ionic product of water’? How has this concept been useful in defining the acidity and basicity of a solution?
MEDIUM

0.1 mole of CH3·NH2Kb=5×10-4 is added to 0.08 moles of HCl and solution is diluted to one liter. The resulting [H+] is:

MEDIUM
Explain the terms ‘Ionic product of water’ and ‘pH value’. How does the former change with temperature? What is pH scale?
EASY
The pH of a solution is 6. Sufficient amount of acid is added to decrease the pH to 2. The increase in hydrogen ion concentration is
EASY
Explain the term ‘ionic product of water’.
EASY
For pure water at 25oC and 50oC, the correct statement is
HARD
The ionization constant of HF, HCOOH and HCN at 298 K are 6.8×10-4, 1.8×10-4 and 4.8×10-9 respectively. Calculate the ionization constants of the corresponding conjugate base.
EASY
If Ka=105 for a weak acid, then pKb for its conjugate base would be -
EASY
What is the [OH] in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 M Ba(OH)2 ?
MEDIUM
What do you understand by the term 'ionic product of water'? How is it represented?
EASY
At 80C0 [H3O+], the concentration is equal to 1 × 10-6 mol L-1. At the same temperature, the value of Kw is: