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प्रश्न
Observe the diagram given below and answer the questions:
- Name the reactants in this reaction.
- Which gas comes out as effervescence in the bigger test tube?
- What is the colour change in the lime water?
- In the above experiment instead of sodium carbonate which chemical can be used to get same products?
- Write the use of acetic acid.
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उत्तर
- The reactants are acetic acid CH3COOH and sodium carbonate Na2CO3.
- The gas produced is carbon dioxide CO2.
- When carbon dioxide gas is passed through lime water, it turns lime water milky or cloudy due to the formation of calcium carbonate. Therefore, the colour change in the limewater would be from clear to milky.
- In the above experiment, instead of sodium carbonate, sodium bicarbonate can be used to get the same products.
- Acetic acid is widely used in the culinary arts as a key ingredient in vinegar. It is also used industrially as a chemical reagent for the production of chemical compounds, in the manufacture of plastics, and in the food industry as a preservative and flavouring agent.
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संबंधित प्रश्न
In an experiment to study the properties of ethanoic acid, a student takes about 3 mL of ethanoic acid in a dry test tube. He adds an equal amount of distilled water to it and shakes the test tube well. After some time he is likely to observe that
(A) a colloid is formed in the test tube.
(B) the ethanoic acid dissolves readily in water.
(C) the solution becomes light orange.
(D) water floats over the surface of ethanoic acid.
When zinc powder is added to acetic acid ______________
(a) the mixture becomes warm
(b) a gas is evolved
(c) the colour of the mixture becomes yellow
(d) a solid settles at the bottom
Give the name and structural formula of one homologue of HCOOH.
Three organic compounds A, B and C have the following molecular formulae: C4H10O
Which compound contains a carboxyl group? Write its name and structural formula.
What is the physical state of CH3COOH?
Name two oxidising agents which can oxidise ethanol to ethanoic acid.
State any two uses of esters.
Acetic acid is a typical acid. Write one equation in case of its reactions with a carbonate.
If you are asked to report your observations about the following two properties of acetic acid, what would you report?
(i) Odour
(ii) Effect on litmus
If you take a pinch of sodium hydrogen carbonate powder in a test-tube and add drop-by-drop acetic acid to it, what would you observe immediately? List any two main observations.
Which of the following observations is true about dilute solution of acetic acid?
(A) It smells like vinegar and turns red litmus blue
(B) It smells like onion and turns blue litmus red
(C) It smells like orange and turns red litmus blue
(D) It smells like vinegar and turns blue litmus red
Explain the following term with example.
Reduction
Why is pure acetic acid also known as glacial acetic acid?
Write a balanced chemical equation for the following:
A mixture of sodalime and sodium acetate is heated.
Ethanoic acid reacts with the basic salt, sodium carbonate, to form a salt, named ______, water and carbon dioxide gas.
Bubbles are seen in the test tube during the preparation of lime water.
Name the oxidising agent used in the conversion of ethanol to ethanoic acid.
Give the balanced chemical equation of the reaction.
Oxidation of ethanol by acidified potassium dichromate.
Give the balanced chemical equation of the following reaction:
Neutralization of NaOH with ethanoic acid.
