Advertisements
Advertisements
प्रश्न
Explain by writing a word equation.
Hard water gets softened on mixing with a solution of washing soda.
उत्तर
To soften the hard water, a solution of washing soda is added to it. This results in a chemical reaction to form a precipitate of insoluble carbonate salts of calcium and magnesium. As the dissolved salts of calcium and magnesium go out in the form of a precipitate of the carbonate salts, the water is softened. The following equation can be written for this chemical change.
Word equation:
Calcium chloride + Sodium carbonate `→` Calcium carbonate + Sodium chloride
Chemical equation (unbalanced):
CaCl2 + Na2CO3 → CaCO3 + NaCl
संबंधित प्रश्न
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
What are homogenous reactions ?
Fill in the blank:
In some chemical reactions an insoluble ________ is formed when two solutions are mixed.
Give a chemical test to distinguish between the following gases.
H2 and O2
What kind of a change is associated with decaying of a plants?
Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.
Galvanization is a process in which ______ is coated as a layer of iron.
Chemical changes are important in our day-to-day life. Give examples.
What is the difference between reactants and products?
What are the chemical reactions that occur in everyday life?
