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प्रश्न
Explain by writing a word equation.
Hard water gets softened on mixing with a solution of washing soda.
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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
Fill in the blank
A new substance is formed in a _______ change.
Name the type of chemical reaction shown by the following equation:
Fe + CuSO4 → FeSO4 + Cu
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Potassium fluoride
What is a chemical reaction?
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
Give an example of the following chemical changes.
A reaction where colour change is noticed.
What is a chemical reaction?
State the following reaction represent oxidation or reduction.
\[\ce{Ag->Ag+}\]
Burning of paper is a ______ change.
______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
