The values of ionic product kw are 0.64 x 10^-14 at 180 C, and 1 x 10^-14 at 25 C from this may be derived that
Correct answer: A. Endothermic process
- A. Endothermic process
- B. Exothermic process
- C. Vaporization process
- D. Change of H2O into O2 and H2
Explanation
The ionic product of water (Kw) is the product of the concentrations of hydrogen ions (H+) and hydroxide ions (OH-) in water. It is defined by the equation: Kw = [H+][OH-] At 180°C, the value of Kw is given as 0.64×10-14, and at 25°C, it is given as 1×10-14. We know that the value of Kw is temperature dependent. As the temperature increases, the value of Kw also increases. The increase in Kw with increasing temperature is an endothermic process. Endothermic processes absorb heat or energy from the surroundings, increasing the value of Kw.
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Le Chatelier's principle predicts how an equilibrium responds when concentration, pressure or temperature changes. Questions apply it to reversible reactions, identify the direction of shift and distinguish genuine equilibrium changes from the effect of a catalyst, which changes the rate of reaching equilibrium but not its position.
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