Write the balanced chemical equation for the following.
In the preparation of Phosphate fertilizers, Calcium phosphate in phosphate rock is converted into phosphoric acid and calcium sulphate.

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Solution

Balanced chemical equation
It is the equation in which the total number of atoms of each element in the reactants, on the left side of the equation is the same as the number of atoms in the products formed, on the right side of the equation.
An equation must be balanced in order to comply with the Law of conservation of Matter.
Law of conservation of matter
It states that matter can neither be created nor destroyed in a chemical reaction.
When Calcium phosphate react with sulphuric acid, Phosphoric acid and Calcium sulphate is formed.
Step 1
Write the skeletal equation
$C a_{3} {(P O_{4})}_{2} (s) + H_{2} S O_{4} (l) \to H_{3} P O_{4} (l) + C a S O_{4} (s)$
Step 2
To equalize Ca, multiply CaSO₄ by 3
$C a_{3} {(P O_{4})}_{2} + H_{2} S O_{4} \to H_{3} P O_{4} + 3 C a S O_{4}$
To equalize SO₄, multiply H₂SO₄ by 3
$C a_{3} {(P O_{4})}_{2} + 3 H_{2} S O_{4} \to H_{3} P O_{4} + 3 C a S O_{4}$
To equalize H , multiply H₃PO₄ by 2
$C a_{3} {(P O_{4})}_{2} (s) + 3 H_{2} S O_{4} (a q) \to 2 H_{3} P O_{4} (a q) + 3 C a S O_{4} (s)$
Thus the equation is balanced.

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Write the balanced chemical equation for the following-

(a) Potassium bromide on treatment with manganese dioxide and sulphuric acid gives manganese and potassium sulphates, bromine and water.

(b) In the preparation of phosphate fertilizers, calcium phosphate in phosphate rock is converted into phosphoric acid and calcium sulphate.

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