1.

Calcium chloride + Sulphuric acid → Calcium sulphate + Hydrogen chloride.

Answer»

Step 1:

Write the chemical equation from the given word equation.

CaCl2 + H2SO4 → CaSO4 + HCl

Step 2:

Write the number of atoms of each element in the unbalanced on both sides of equation.

ElementNumber of atoms in reactantsNumber of atoms in products
Ca11
Cl21
H21
S11
O44

Step 3:

In the given equation H2SO4 is a compound and it contains hygrogen element. On the left hand side there are two hydrogen atoms and on the right side one hydrogen atom. Equalise H atoms on both sides.

Hydrogen atomsIn reactants (H2SO4)In products (HCl)
Initially21
To balance22  × 1

To equalise the number of hydrogen atoms we use 2 as the factor in the product so that the number of H atoms on both sides are equal. Therefore, the equation becomes

CaCl2 + H2SO4 → CaSO4 + 2 HCl

Now, count the atoms of each element on both sides of the equation. The number of atoms on both sides are equal hence, the balanced equation is

CaCl2 + H2SO4 → CaSO4 + 2 HCl

Now, indicate the physical state of the reactants and products.

CaCI2(s) + H2SO4(I) → CaSO4(s) + HCI(I)


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