Advertisements
Advertisements
Question
Bubbles are seen in the test tube during the preparation of lime water.
Advertisements
Solution
Lime water is a saturated solution of calcium hydroxide (Ca(OH)2). It is commonly prepared by passing carbon dioxide gas through a solution containing quicklime (CaO) or slaked lime (Ca(OH)₂) in water.
- Formation of Lime Water: \[\ce{CaO + H2O -> Ca(OH)2}\]
Quicklime reacts with water to form slaked lime (calcium hydroxide), which dissolves slightly in water to form lime water. - Bubbling of CO₂ (Observation of Bubbles): \[\ce{Ca(OH)2 + CO2 -> CaCO3 ↓ + H2O}\]
-
When CO₂ gas is passed through the lime water, it reacts with the calcium hydroxide.
- The bubbles observed are CO₂ gas bubbles.
- The reaction produces calcium carbonate, which causes the solution to turn milky.
-
APPEARS IN
RELATED QUESTIONS
Ethanoic acid has a .................... odour.
(a) Rotten eggs
(b) Pungent
(c) Vinegar-like
(d) Mild
Write three different chemical reactions showing the conversion of ethanoic acid to sodium ethanoate. Write balanced chemical equation in each case. Write the name of the reactants and the products other ethanoic acid and sodium ethanoate in each case.
A student adds 2 mL of acetic acid to a test tube containing 2 mL of distilled water. He then shakes the test tube well and leaves it to settle for some time. After about 5 minutes he observes that in the test tube there is :
(A) a clear transparent colourless solution
(B) a clear transparent pink solution
(C) a precipitate settling at the bottom of the test tube
(D) a layer of water the layer of acetic acid
How esters are prepared ?
You have four test tubes, A, B, C and D containing sodium carbonate, sodium chloride, lime water and blue litmus solutions respectively. Out of these the material of which test tube/ test tubes would be suitable for the correct test of acetic/ethanoic acid?
(a) only A
(b) A and B
(c) B and C
(d) A and D
What is the common name of methanoic acid?
Give the name and structural formula of one homologue of HCOOH.
Write the formula of ethanoic acid.
Which of the following will give brisk effervescence with sodium hydrogen carbonate and why?
CH3COOH, CH3CH2OH
How does ethanoic acid react with sodium hydrogen carbonate? Give equation of the reaction which takes place.
Give any two uses of ethanoic acid.
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
A student adds 4 mL of acetic acid to a test tube containing 4 mL of distilled water. He then shakes the test tube and leaves it to settle. After about 10 minutes he observes:
(A) a layer of water over the layer of acetic acid
(B) a layer of acetic acid over the layer of water
(C) a precipitate settling at the bottom of the test tube
(D) a clear colourless solution
What is the action of acetic acid with litmus paper?
State how the following conversions can be carried out:
Ethyl alcohol to Ethane
Give a balanced chemical equation for the following conversion:
Calcium carbide to ethyne.
In the presence of the acid catalyst, ethanoic acid reacts with ethanol and ______ ester is produced.
Write the chemical equation for the following:
Esterification Reaction
Give the balanced chemical equation of the following reaction:
Neutralization of NaOH with ethanoic acid.
Give the balanced chemical equation of the following reaction:
Combustion of ethanol.
