Class 10 Chemistry simulations · Acids, Bases and Salts

Acid–base indicators

Test common solutions with litmus, phenolphthalein, methyl orange, turmeric and universal indicator.

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What to notice

Acids turn blue litmus red; bases turn red litmus blue and phenolphthalein pink. Universal indicator shows the pH by colour.

Key relation

pH < 7 acidic, pH = 7 neutral, pH > 7 basic

Try this

Find a solution that turns phenolphthalein pink but is only weakly basic.

What you can change

• Solution: choose Dilute hydrochloric acid, Lemon juice, Vinegar, Distilled water, Baking soda solution, Soap solution, Dilute sodium hydroxide
• Indicator: choose Blue litmus paper, Red litmus paper, Phenolphthalein, Methyl orange, Turmeric, Universal indicator

More in Acids, Bases and Salts

• Buffer solutions (Henderson equation)
• pH of acids and bases
• Neutralisation: acid + base → salt + water

See all Class 10 Chemistry simulations or every Physica simulation.