Remarkably, they have an aqueous path that passes water without being permeable to the common ions. Ion channels are involved in every thought, every perception, every movement, every heartbeat.

The addition of NH 4 Cl to a solution of ammonia shows the effect of adding a common ion to a system at equilibrium.

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The table shows the flame test colours for five common metal ions. The same colours are obtained whether the test compound is in the solid state or dissolved in water.