Question

1 gram quick lime dissolves in 10 ml of water and produces a colourless solution​

Answer 1

Answer:

1 gram quick lime dissolves in 10 ml of water and produces a colourless solution due to production of heat. ... The reaction is a combination reaction owing to the fact that calcium oxide and water react with each other to form only one single product i.e. calcium hydroxide.

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Answer 2

Answer:

Quicklime (calcium oxide) and water chemically react to form hydrated lime (calcium hydroxide), a compound that is only slightly soluble in water. For a solubility comparison, table salt (NaCl) has a solubility in water of 36.0 grams per 100 grams of saturated solution at 20 degrees C, as compared to hydrated lime, which has a solubility in water of 0.165 grams at the same temperature and volume of water. The two factors that enable lime to be so effective a base, despite its low solubility in water, are: (1) The smallness of the hydrated lime particle size and (2) the double hydroxyl groups that result from each molecule of lime that does go into solution (dissociates in water).

The hydrated lime particle is so small that, when the lime/water mixture is agitated, the lime particles stay in suspension for a relatively long time, even if the agitation is stopped. This is due to "brownian motion" (the constant vibration of water molecules) which constantly buffet the suspended lime particles. If the solution is constantly agitated (mixed) the particles will remain in suspension indefinitely. The suspended particles have a very high total surface area which means that, as the lime in solution is used up in reactions, more lime quickly dissolves into the solution ( Le Chatelier's Principle -" ... if a change is imposed on a system at equilibrium, the position of the equilibrium will shift in a direction that tends to reduce that change.") Each molecule of calcium hydroxide that ionizes produces two hydroxyl ions (OH-), thus providing a plentiful supply of neutralizing power. A good analogy of the effect of particles with a high surface area is that of a granary explosion. Grain, in a pile, is not all that combustible. However, if you pulverize it, and then suspend it as a fine dust in the air, a spark can result in an explosion.