Question

Three beakers labelled l, ll, and lll were each filled with 50 cm3 of distilled water. The temperature of the water was set at 20 degree Celsius, 35 degree Celsius and 60 degree Celsius respectively . 1 g of copper(ll) sulphate crystal was added to each beaker.

In which beaker did copper(ll) sulphate take the i) shortest time and ii) longest time to completely diffuse throughout the water? Explain your answer

Answer 1

Answer:

When crystals are added in a glass of cold and hot water, the following observations are observed:

i) In a glass of cold water, the crystals settle down to the bottom and in case of hot water, it slowly spreads. The crystals can be observed dissolving in the water just above and blue/ purple color is observed.

ii) After some time, the hot water becomes blue/purple and in cold water, no appreciable color change is observed because of less dissolution of crystals.

iii) From the above observation, we can conclude that particles of matter move continuously and possess kinetic energy. The particles of matter also have diffusion property.

iv) As the kinetic energy of particles depends on temperatures and increases with the increase of temperature. So, the rate of mixing also increases as observed in the case of hot and cold water.