Write down the molecular formula and one use of each of the following: [2] i) Boric acid [0.5] ii) Borax [0.5] iii) Silica gel [0.5] iv) Sodium silicate. [0.5]

i) Boric acid Molecular formula: H3BO3 One use: Used as an antiseptic in eye lotions and ointments. ii) Borax Molecular formula: Na2B4O7·10H2O One use: Used as a water softener in detergents and as a buffer in chemical laboratories. iii) Silica gel Molecular formula: SiO2·nH2O (hydrated silicon dioxide) One use: Used as a drying agent to absorb moisture in laboratories and food packaging. iv) Sodium silicate Molecular formula: Na2SiO3 One use: Used in the manufacture of soaps, adhesives, and as a waterproofing agent.

Write down the molecular formula and one use of each of the following: [2] i) Boric acid… – Chemistry NEB 2076 (old course) Solution

i) Boric acid

Molecular formula: $H X_{3} BO X_{3}$
One use: Used as an antiseptic in eye lotions and ointments.

ii) Borax

Molecular formula: $Na X_{2} B X_{4} O X_{7} \cdot 10 H X_{2} O$
One use: Used as a water softener in detergents and as a buffer in chemical laboratories.

iii) Silica gel

Molecular formula: $SiO X_{2} \cdot n H X_{2} O$ (hydrated silicon dioxide)
One use: Used as a drying agent to absorb moisture in laboratories and food packaging.

iv) Sodium silicate

Molecular formula: $Na X_{2} SiO X_{3}$
One use: Used in the manufacture of soaps, adhesives, and as a waterproofing agent.

Write down the molecular formula and one use of each of the following: [2] i) Boric acid [0.5] ii) Borax [0.5] iii) Silica gel [0.5] iv) Sodium silicate. [0.5]

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