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In the first case: The reason for the appearance of the blue color in the filter is due to the ability of the methylene blue particles
to pass through the pores of the filter paper, in addition to the force of attraction (bonding) between the methylene blue
particles and the water molecules.The force of attraction between water molecules to each other is
stronger than the force of water molecules attracting the dye, which leads to the rush of the dye molecules to accumulate on the
surface of the charcoal particles, leaving the water molecules to pass through the clear filter paper free of the dye colored
methylene blue particles.The pores of the filter paper, so that the filter becomes blue again.
In the first case: The reason for the appearance of the blue color in the filter is due to the ability of the methylene blue particles
to pass through the pores of the filter paper, in addition to the force of attraction (bonding) between the methylene blue
particles and the water molecules.
• In the second case: the lack of blue color in the (colorless) filter is due to the fact that when a methylene blue solution is mixed
with activated charcoal powder, this leads to the accumulation of methylene blue dye particles on the surfaces separating the
charcoal and water, where The pigment particles are adsorbed on the surfaces of the activated charcoal, due to the force of
attraction between the charcoal and the dye molecules of methylene Blue Solutions, is greater than the force of attraction
between the methylene blue dye molecules and water. The force of attraction between water molecules to each other is
stronger than the force of water molecules attracting the dye, which leads to the rush of the dye molecules to accumulate on the
surface of the charcoal particles, leaving the water molecules to pass through the clear filter paper free of the dye colored
methylene blue particles.
• In the third case: the blue color appears again, due to the addition of alcohol to the precipitate, as the force of attraction
between the particles of the methylene blue dye and the alcohol is greater than the force of attraction between the particles of
the dye and charcoal. The pores of the filter paper, so that the filter becomes blue again.
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