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
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
A gas is liberated immediately with a brisk effervescence, when you add acetic acid to sodium hydrogen carbonate powder in a test tube. Name the gas and describe the test that confirms the identity of the gas.
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 common name and IUPAC name of the following compound:
CH3COOН
What type of compound is CH3COOH?
State any two uses of esters.
An organic compound A (molecular formula C2H4O2) reacts with Na metal to form a compound B and evolves a gas which burns with a pop sound. Compound A on treatment with an alcohol C in the presence of a little of concentrated sulphuric acid forms a sweet-smelling compound D (molecular formula C3H6O2). Compound D on treatment with NaOH solution gives back B and C. Identify A, B, C and
Name the product formed and give an appropriate chemical equation for the following:
Ethanol oxidised by acidified potassium dichromate.
Give the structural formula of Acetic acid.
Under what conditions does ethane get converted to ethyl alcohol?
Name the first four members of alphatic carboxylic acid.
State how the following conversion can be carried out:
Ethyl chloride to Ethene.
When acetaldehyde is oxidized with acidified potassium dichromate, it forms ______.
Identify the term or substance based on the descriptions given below:
Hydrocarbon containing a triple bond used for welding purposes
A compound X when treated with an organic acid Y (having vinegar-like smell) in the presence of the acid Z, forms a compound P which has a fruity smell.
- Identify X, Y and Z
- Write the structural formula of X and Y.
- What type of compound is P?
- Name the above reaction.
- If compounds X and Y both have 2 carbon atoms. Write the reaction.
Ethanoic acid _________.
When ethanoic acid is treated with NaHCO^ the gas evolved is ______.
Shristi heated Ethanol with a compound A in presence of a few drops of concentrated sulphuric acid and observed a sweet smelling compound B is formed. When B is treated with sodium hydroxide it gives back Ethanol and a compound C.
- Identify A and C
- Give one use each of compounds A and B.
- Write the chemical reactions involved and name the reactions.
How is ethanol to ethanoic acid an oxidation reaction different from the reaction in which ethanol burns in the presence of oxygen?
