Chemistry
Give a reason why -
(a) Alcohol & water form a miscible mixture while oil & water do not.
(b) Boiled water tastes flat.
(c) On opening a bottle of soda the gas escapes out with a 'fizz'.
Answer
(a) As alcohol is soluble in water hence they form a miscible mixture whereas oil is not soluble in water hence they both form an immiscible mixture.
(b) As soluble gases in water contribute to the taste of water and on boiling, the temperature of the water increases, thereby the solubility of the dissolved gases decreases and the dissolved gases are expelled out. Hence, boiled water tastes flat.
(c) Soda bottles contains carbon dioxide dissolved in water under pressure. On opening the bottle, the pressure decreases hence solubility of dissolved carbon dioxide decreases & the gas escapes out with a 'fizz'.
Related Questions
Explain how each of the following factors affects the formation of a solution
(a) Proportion of - solute & solvent
(b) Particle size of the solute
(c) Temperature of the solvent.
Define the term 'solubility' of a solute in water. If 10 g. of a solute is added to 100 g. of water at 50°C and stirred, it is seen that the total solute dissolves at that temperature giving an unsaturated solution. Is 10 g. the solubility of the solute in water. Give reasons.
Give the importance of -
(a) Dissolved minerals & salts
(b) Dissolved air
in water.
How are solutions generally classified. What is the basis of this classification.