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There are three types of economic indicators, depending on their
timing: leading, lagging, and coincident indicators.
Bromocresol green will ionize to give the monoanionic form (yellow), that further deprotonates at
higher pH to give the dianionic form (blue), which is stabilized by resonance.
Add 5 g to 500 mL of ethanol, add 500 mL water. Stir.
Dissolve 1 g of phenolphthalein powder in 500 mL of 50% alcohol.
Add drops of this phenolphthalein solution to 100 mL of 0.5 mol / litre sodium hydroxide solution until a deep pink colour appears. Add colourless phenolphthalein indicator to lime water.
