Advertisements
Advertisements
प्रश्न
Bubbles are seen in the test tube during the preparation of lime water.
Advertisements
उत्तर
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
संबंधित प्रश्न
Ethanoic acid has a .................... odour.
(a) Rotten eggs
(b) Pungent
(c) Vinegar-like
(d) Mild
The molecular formula of acetic acid is _________ .
(a) CH3COOH
(b) CH3 – CH3
(c) C6H6
(d) C2H4
Draw the structure for the following compound.
Ethanoic acid
Give the common names and IUPAC names of the following compounds of HCOOH.
Draw the structure of butanoic acid.
Describe a test for carboxylic acid.
What happens when propanoic acid is warmed with methanol in the presence of a few drops of concentrated sulphuric acid? Write equation of the reaction involved.
Write the IUPAC name of the following:
\[\begin{array}{cc}
\ce{CH3}\\
|\\
\ce{CH3 -C -CH3}\\
|\\
\ce{CH3}
\end{array}\]
What do you notice when acetic acid reacts with metals?
What do you observe when acetic acid is added to ethyl alcohol in the presence of sulphuric acid?
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.
Write the chemical equation for the following:
Combustion of methane
Choose the correct answer:
Select the acid which contains four hydrozen atoms in it.
Ethanoic acid _________.
Give a chemical reaction in which a catalyst is used.
Vinegar is a solution of ______.
Which of the following represents saponification reaction?
In the presence of the acid catalyst, ethanoic acid reacts with ethanol and ______ ester is produced.
Give the balanced chemical equation of the following reaction:
Neutralization of NaOH with ethanoic acid.
Give the balanced chemical equation of the following reaction:
Neutralization of NaOH with ethanoic acid.
