In the water garden experiment, the metal ions of salts react with sodium silicate to form silicate colloids, while the metal ions of different colors will form colloids of different colors [5]. A semipermeable membrane is formed between the colloid and the sodium silicate aqueous solution, and the water in the solution penetrates into the membrane due to osmotic pressure, which eventually causes the semipermeable membrane to burst; after the semipermeable membrane breaks, the salts in it contact with the sodium silicate again, and the reaction of forming colloid again occurs<br>
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