Chameleon bubbles

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Chameleon bubbles are formed when a sodium alginate solution is dropped into a calcium chloride solution.  The bubbles are filled by an acid‐base indicator solution; so, adding the beads to acids or bases leads to colour changes inside the bubbles by diffusion and pH change. Students can learn about acids, bases, indicators, neutralisation, and diffusion through semi‐permeable membranes through solving this mystery.

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