a) What is a natural indicator? Give some examples.
b) Why is litmus better than other natural indicator?
c) Why does a turmeric stain on white clothes is turned to red when it is washed with
soap?
d) What happens when turmeric reacts with acid, base or with neutral substance?
e) Differentiate between acid and base.
Answers
1) NATURAL INDICATORS- ARE THOSE INDICATORS THAT TELLS US WHETHER THE SUBSTANCE IS ACIDIC OR BASIC.
2) Litmus is a water-soluble mixture of different dyes extracted from lichens. It is often absorbed onto filter paper to produce one of the oldest forms of pHindicator, used to test materials for acidity.thats why it is better than other natural indicators.
3). On washing with soap, a turmeric stain on the cloth turns to red because. ... soap solution is acidic. as . turmeric contains a natural indicator.
4) Turmeric is yellow in colour. When a base is added to it, the solution turns into pink colour. However turmeric remains yellow when an acid or neutral solution is added to it.
5) According to the Lowry-Bronsted definition, an acid is a proton donor and a base is a proton acceptor.
. A base is a substance that can accept protons or donate a pair of valence electrons to form a bond. Bases can be thought of as the chemical opposite of acids....
a)The indicators that are obtained from plants are known as natural indicators. Examples – Turmeric, china rosa, red cabbage and grape juice. Some flowers such as the hydrangeas can also determine whether a substance is acidic or basic.
b)Because universal indicator can turn a range of different colours, it is helpful in specifying the strength of an acid or alkali. As a result, it gives a more precise result than litmus paper, which only tells you if a solution is an acid or alkali.
c)On washing with soap, a turmeric stain on the cloth turns to red because. ... soap solution is acidic. C. turmeric contains a natural indicator.
d)This activity uses turmeric, a common spice in curry, as an indicator for acidity and basicity. Turmeric is yellow in acid and neutral substances, but turns bright red with bases.
e)A substance, mostly liquid that donates a proton or accepts an electron pair in reactions. An acid increases the concentration of H+ ions. A base is a substance that releases hydroxide (OH-) ions in aqueous solution, donates electrons and accepts protons.
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