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(a) Explain the following phenomena with...

(a) Explain the following phenomena with the help of Henry's law.
(i) Painful condition known as bends.
(ii) Feeling of weakness and discomfort in breating at high altitude.
(b) Why soda water bottle kept at room temperature fizzes on opening?

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The gas which adds acidic flavour to soft drinks is carbon dioxide. The amount of gas which dissolves under ordinary pressure is not enough to produce the desired effect. Therefore, carbonated beverages are bottled under high pressure to ensure high concentration of `CO_(2)` when the bottle is opened in air, the partial pressure of `CO_(2)` above the solution decreases and `CO_(2)` bubbles out, i.e., fizzes.
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