Question

prepare various solutions with different densities by adding some drops of ink in different amounts of water and explain the principle involved in to your friends

Answer 1

Ink diffuses in water because of the random motion of water and ink molecules. On a large scale, we don’t see the individual molecules moving. Instead we see how dark the ink is at different points in the solution, which actually indicates its concentration. You can see the ink move from areas of higher concentration to those of lower concentration, and the rate of this movement is proportional to the diffusion coefficient of the ink in water.

Answer 2

Details on preparation of different concentrations of ink-water solution are as follows.  

The main principle behind the mixture of ink and water are:  

-Collision of molecules  

-Diffusion  

-Random movement of molecules  

Process:  

When drops of ink are added to water, the water molecules make random movement and collide with the ink molecules. Now, the ink molecules also make random movement and move from area of higher to lower concentration of molecules. Thus, it forms a colloidal solution of ink and water.  

Rate of diffusion depends on temperature of water. When water is hot, diffusion occurs fast

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