Rajesh wants to test the given substances as an acid or base, he used
turmeric as an indicator, indicate which substance will be an acid and
base. Sunder, Rajesh's class mate added litmus solution instead of
turmeric in another set of the test tubes with same substances, what will
be the outcome? Draw a table to show results. Test Tube A - Vinegar. Test
tube B - soap solution
Ay your
Answers
Answer:
Objective
This topic gives an overview of;
Acids And Bases
Litmus: A Natural Dye
Turmeric :Natural Indicator
China Rose as Indicator
Acid Rain
Indicators
We use in our daily life a large number of substances such as lemon, tamarind, common salt ,sugar and vinegar. Many substances that you encounter in your daily life have different properties. One major difference between substances is whether they are acidic or basic.
Some of the substances like Lemon juice, Vinegar, Curd, Grapes ,Unripe mango, Sugar, Tamarind taste sour, some taste bitter,some taste sweet and some taste salty.
Acids And Bases
Curd, lemon juice, orange juice and vinegar taste sour. These substances taste sour because they contain acids. The chemical nature of such substances is acidic. The word acid comes from the Latin word acere which means sour. The acids in these substances are natural acids.
Baking soda does not taste sour it means, that it has no acids in it. It is bitter in taste. If you rub its solution between fingers, it feels soapy. Substances like these which are bitter in taste and feel soapy on touching are known as bases. The nature of such substances is said to be basic.
Special type of substances are used to test whether a substance is acidic or basic. These substances are known as indicators. The indicators change their colour when added to a solution containing an acidic or a basic substance. Turmeric, litmus, china rosepetals (Gudhal), etc., are some of the naturally occurring indicators.