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Question

# Write the chemical formulae and hence balance the following word equationAmmonium chloride+calcium hydroxide$\to$calcium chloride+ammonia+water

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Solution

## Balanced chemical equation: A balanced chemical equation represents an equation in which the number of atoms of each element is equal on both the reactant and product sides.Balancing of given reaction:Step 1: Calculating the number of atoms on both sides of the reactionAmmonium chloride reacts with calcium hydroxide to form Calcium chloride, ammonia, and water.$\underset{\mathrm{Calcium}\mathrm{hydroxide}}{\mathrm{Ca}{\left(\mathrm{OH}\right)}_{2}}+\underset{\mathrm{Ammonium}\mathrm{chloride}}{{\mathrm{NH}}_{4}\mathrm{Cl}}\to \underset{\mathrm{Calcium}\mathrm{chloride}}{{\mathrm{CaCl}}_{2}}+\underset{\mathrm{Ammonia}}{{\mathrm{NH}}_{3}}+\underset{\mathrm{Water}}{{\mathrm{H}}_{2}\mathrm{O}}$ElementsNumber of atoms on the reactant sideNumber of atoms on the product side$\mathrm{Ca}$11$\mathrm{O}$21$\mathrm{H}$65$\mathrm{N}$11$\mathrm{Cl}$12Step 2: Balancing the uneven number of atoms on the reactants and product sideAs the atoms of each element are not equal on both sides of the reaction we need to add stoichiometric coefficients to balance each elementTo balance the chlorine we multiply the reactant side with ‘2’To balance the nitrogen we multiply the product side with ‘2’To balance the hydrogen we multiply the product side with ‘2’The equation becomes: $\underset{\mathrm{Calcium}\mathrm{hydroxide}}{\mathrm{Ca}{\left(\mathrm{OH}\right)}_{2}}+\underset{\mathrm{Ammonium}\mathrm{chloride}}{2{\mathrm{NH}}_{4}\mathrm{Cl}}\to \underset{\mathrm{Calcium}\mathrm{chloride}}{{\mathrm{CaCl}}_{2}}+\underset{\mathrm{Ammonia}}{2{\mathrm{NH}}_{3}}+\underset{\mathrm{Water}}{2{\mathrm{H}}_{2}\mathrm{O}}$ElementsNumber of atoms on the reactant sideNumber of atoms on the product side$\mathrm{Ca}$11$\mathrm{O}$22$\mathrm{H}$1010$\mathrm{N}$22$\mathrm{Cl}$22The final balanced reaction is : $\underset{\mathrm{Calcium}\mathrm{hydroxide}}{\mathrm{Ca}{\left(\mathrm{OH}\right)}_{2}}+\underset{\mathrm{Ammonium}\mathrm{chloride}}{2{\mathrm{NH}}_{4}\mathrm{Cl}}\to \underset{\mathrm{Calcium}\mathrm{chloride}}{{\mathrm{CaCl}}_{2}}+\underset{\mathrm{Ammonia}}{2{\mathrm{NH}}_{3}}+\underset{\mathrm{Water}}{2{\mathrm{H}}_{2}\mathrm{O}}$

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