how will you that starch is colloid?

Answer 1

I take that the question is ' How will you prove that starch is a colloid ?'

A Colloid or colloidal dispersion is a type of homogenous mixture .

A colloid consists of two separate phases: a dispersed phase and a continuous phase ( here it is water ).

In a colloid, the dispersed phase is made of tiny particles (Here it is starch particles ) or droplets that are distributed evenly throughout the continuous phase.

The size of the dispersed phase particles are between 1 nm and 1000 nm in at least one dimension.

Homogeneous mixtures with a dispersed phase in this size range may be called colloidal aerosols, colloidal emulsions, colloidal foams, colloidal dispersions ( this is applicable to a starch and water colloid )or hydrosols.

The dispersed phase particles or droplets are largely affected by the surface chemistry present in the colloid.

Because the size of the dispersed phase may be hard to measure, and because colloids look like solutions, colloids are sometimes characterized by their properties.

For example, if a colloid has a solid phase dispersed in a liquid (As in the present case .), the solid particles will not pass through a membrane, whereas the dissolved ions or molecules of a solution will pass through a membrane.

In other words, dissolved components will diffuse through a membrane through which dispersed colloidal particles will not.

So starch mixed with water is a colloid .

Remember starch by itself is NOT a colloid. Just as sugar by it self is NOT a solution . To form a solution it is to be DISSOLVED in water and it dissolves in water.

Whereas starch DOES NOT dissolve in water and forms a colloid in it .

Your question requires drastic rephrasing

Answer 2

how will i what?

Answer 3

Please re-phrase your question.