Advertisements
Advertisements
Question
When water is added to compound (A) of calcium, solution of compound (B) is formed. When carbon dioxide is passed into the solution, it turns milky due to the formation of compound (C). If excess of carbon dioxide is passed into the solution milkiness disappears due to the formation of compound (D). Identify the compounds A, B, C and D. Explain why the milkiness disappears in the last step.
Advertisements
Solution
Compound A reacts with water to form compound B. So, the compound A is calcium oxide. When water is added to calcium oxide, calcium hydroxide is formed. It is lime water. The compound gives a milky appearance which is compound C. The compound C is calcium carbonate. On passing, excess carbon dioxide milkiness disappears due to the formation of compound D. The compound is calcium hydrogen carbonate. The reactions are as follows:
\[\ce{CaO + H2O -> Ca(OH)2}\]
\[\ce{Ca(OH)2 + CO2 -> CaCO3}\]
\[\ce{Ca(OH)2 + CO2 + H2O -> Ca(HCO3)2}\]
APPEARS IN
RELATED QUESTIONS
Describe the importance of the limestone.
Describe the importance of the cement.
Describe the importance of the plaster of paris.
Dead burnt plaster is ______.
Suspension of slaked lime in water is known as ______.
A substance which gives brick red flame and breaks down on heating to give oxygen and a brown gas is ______.
Dehydration of hydrates of halides of calcium, barium and strontium i.e., CaCl26H2O, BaCl2.2H2O, SrCl2.2H2O, can be achieved by heating. These become wet on keeping in air. Which of the following statements is correct about these halides?
Several sodium compounds find use in industries. Which of the following compounds are used for textile industry?
(i) Na2CO3
(ii) NaHCO3
(iii) NaOH
(iv) NaCl
A substance absorbs \[\ce{CO2}\] and violently reacts with water. That substance is ______.
What are the products formed in sequence when excess of CO2 is passed in slaked lime?
The conversion of hydroxyapatite occurs due to presence of p - ions in water. The correct formula of hydroxyapatite is ______.
\[\ce{Y <-[\Delta, 205°C] CaSO4.2H2O ->[\Delta, 120°C] X}\]
X and Y are respectively:
The commercial name for calcium oxide is ______.
In curing cement plasters, water is sprinkled from time to time. This helps in ______.
The substance not likely to contain CaCO3 is ______.
