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
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
In order to study saponification reaction, we first prepare 20% solution of sodium hydroxide. If we record the temperature of this solution just after adding sodium hydroxide flakes to water and also test its nature using litmus, it may be concluded that the process of making this solution is
(A) exothermic and the solution is alkaline
(B) endothermic and the solution is alkaline
(C) endothermic and the solution is acidic
(D) exothermic and the solution is acidic
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
Complete the following chemical equation:
\[\ce{CH3COOC2H5 + NaOH ->}\]
Complete the following chemical equations :CH3COOH+NaOH→
Choose the correct alternative and rewrite the following:
Acetic acid ..................
Give the common name and IUPAC name of C2H5OH.
Name the gas evolved when ethanoic acid is added to sodium carbonate. How would you prove the presence of this gas?
How would you convert:
Propanol into propanoic acid.
Name the process in the given case and write the equations of the reactions involved.
When ethanoic acid reacts with sodium hydrogen carbonate, then a salt X is formed and a gas Y is evolved. Name the salt X and gas. Y Describe an activity with the help of a labelled diagram of the apparatus used to prove that the evolved gas is the one which you have named. Also write the chemical equation of the reaction involved.
Acetic acid is a typical acid. Write one equation in case of its reactions with a carbonate.
Write the molecular formulae and structure formula of ethanic acid?
Using appropriate catalysts, ethane can be oxidized to an alcohol. Name the alcohol formed when ethane is oxidized.
State the observation
When the gaseous product obtained by dehydration of ethyl alcohol is passed through bromine water.
Identify the term or substance based on the descriptions given below:
Ice like crystals formed on cooling an organic acid sufficiently.
Ethanoic acid turns ______ litmus to ______
Reshu by mistake forgot to label the two test tubes containing Ethanol and Ethanoic acid. Suggest an experiment to identify the substances correctly? Illustrate the reactions with the help of chemical equations.
Write an equation showing saponification.
Give the balanced chemical equation of the following reaction:
Neutralization of NaOH with ethanoic acid.
