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प्रश्न
What do you observe when you drop a few drops of acetic acid to test tubes containing
(a) phenolphthalein
(b) distilled water
(c) universal indicator
(d) sodium hydrogen carbonate powder
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उत्तर
Acetic acid is a weak acid. The following changes occur when a few drops of acetic acid are added to the given solutions:-
(i) Phenolphthalein remains colourless, as acetic acid shows a change in colour in basic substances.
(ii) Acetic acid dissolves in distilled water.
(iii) Acetic acid turns the colour of the universal indicator to pale orange.
(iv) When added to sodium hydrogen carbonate powder, acetic acid causes effervescence because of the evolution of carbon dioxide gas in the process.
CH3COOH(aq) + NaHCO3(s) → CH3COONa(aq) + H2O(l) + CO2(↑)
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संबंधित प्रश्न
A student adds a spoon full of powdered sodium hydrogen carbonate to a flask containing ethanoic acid. List two main observations, he must note in his note book, about the reaction that takes place. Also write chemical equation foe the reaction.
A student takes about 6 ml of distilled water in each of the four test tubes P, Q, R and S. He then dissolves an equal amount of four different salts namely, sodium chloride in 'P', potassium chloride in 'Q', calcium chloride in 'R' and magnesium chloride in 'S'. Next, he then adds 10 drops of soap solution to each test tube and shakes its contents. The test tubes in which scum (insoluble substance) is formed with soap are:
(A) P and Q
(B) Q and R
(C) R and S
(D) Q and S
What is the common name of ethanoic acid?
Which of the following molecular formula corresponds to ethylbutanoate ester?
(a) C5H10O2
(b) C6H12O2
(c) C7H14O2
(d) C8H16O2
A student takes Na2CO3 powder in a test tube and pours some drops of acetic acid over it. He observes:
(A) no reaction in the test tube
(B) colourless gas with pungent smell
(C) bubbles of a colourless and odourless gas
(D) white fumes with smell of vinegar
Give a balanced chemical equation for the following conversion:
Calcium carbide to ethyne.
Assertion (A): Esterification is a process in which a sweet-smelling substance is produced.
Reason (R): When esters react with sodium hydroxide an alcohol and sodium salt of carboxylic acid are obtained.
Give the balanced chemical equation of the following reaction:
Neutralization of NaOH with ethanoic acid.
A few drops of ethanoic acid were added to solid sodium carbonate. The observation made was that ______.
A student while observing the properties of acetic acid would report that this smells like ______.
