Student Projects/Acids & Bases

ACIDS AND BASES

Turmeric as a natural indicator

Definition of an indicator

The substance which is used to test whether the given substance is acidic or basic in nature is called an indicator.A type of indicators which are found naturally are called natural indicators.

Examples of an indicator

Turmeric, China rose petals, litmus, red cabbage etc.

Acids

vinegar (acetic acid)

Orange, lemons (citric acid)

Curd (lactic acid)

Grapes, Tamarind (tartaric acid)

Bases

soap solution

Baking soda

Tooth paste

Lime water

The effect of turmeric indicator on acidic and basic solution

Turmeric paper (yellow colour) turns into red when it is dipped into basic solution. And it does not change its colour with acid.

EFFECT OF TURMERIC
SLNO	TEST SOLUTION	EFFECT	REMARKS
1	SOAP SOLUTION	TURNED TO RED	BASE
2	BAKING SODA	TURNED TO RED	BASE
3	LIME WATER	TURNED TO RED	BASE
4	SUGAR SOLUTION	NO CHANGE	ACID
5	LEMON JUICE	NO CHANGE	ACID

Effect on China Rose

We can use China rose petals (pink colour) as an indicator which turns acidic solutions to dark pink and basic solutions to green.