Advertisements
Advertisements
Question
Explain by writing a word equation.
Limestone powder disappears on adding to dilute hydrochloric acids.
Advertisements
Solution
Limestone is predominantly Calcium carbonate(CaCO3). When calcium carbonate reacts with a 10% solution of HCl. Then Calcium chloride is formed as a salt along with water and carbon dioxide gas (brisk effervescence).
2HCl + CaCO3 → CaCl2 + CO2 +H2O
In this reaction, we add hydrogen ions (H+), which will react with the carbonate ion [\ce{(CO^{2-}_3)}\] to form hydrogen carbonate \[\ce{(HCO^-_3)}\] ions, which are soluble in water and the limestone will dissolve.
RELATED QUESTIONS
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Which one of the following alters the rate of the chemical reaction without itself undergoing any change?
- temperature and Pressure
- concentration of reactants
- presence of catalyst
- none of these
FILL IN THE BLANK
On reaction with sulphuric acid solution, barium chloride forms a white precipitate of ........ sulphate.
True or false
New substances are formed in a chemical change.
State what you would observe when the following substance is heated in a glass test tube Copper (II) carbonate Red lead .
Explain the following reaction with one suitable example of Combination reactions .
Write your observation and a balanced equation in the case of the following substances being heated.
Copper carbonate.
State the following reaction represent oxidation or reduction.
\[\ce{Cl- ->Cl}\]
Give a balanced equation for a reaction involving the evolution of gas on the addition of dilute acid to sodium sulphite.
Limestone contains ______ mainly.
Silver articles turning black: ______:: Boiling of H2O: physical change ______.
