The presence of hydrogen gas evolved from the reaction of acids with metals is confirmed through the soap bubble test.

The pH scale ranges from 0 to 14. A pH > 7 indicates a basic solution.

Olfactory indicators are those substances whose smell changes in acidic or basic media. The sources list onion, vanilla, and clove as olfactory indicators.

The salt formed from a strong acid and strong base is neutral.

Acid rain is defined by a pH value less than 5.6, which affects aquatic life.

Plaster of Paris is derived by heating gypsum (CaSO₄·2H₂O).

Non-metallic oxides behave as acidic oxides since they react with bases to produce salt and water (e.g., CO₂ + Ca(OH)₂).

Washing Soda is Na₂CO₃·10H₂O.

Weak acids, such as CH₃COOH, produce fewer H⁺ ions compared to strong acids like HCl or H₂SO₄.

Sodium Hydroxide is prepared through the Chlor-Alkali process.

HCl gas ionises in water to form hydronium ions (H₃O⁺) and Cl⁻ ions.

Metal carbonates and hydrogencarbonates react with acids to yield salt, CO₂, and water.

Uses listed include bleaching textiles/paper, acting as an oxidizing agent, and disinfecting water.

This is the definition of a neutralisation reaction.

CO₂ gas is tested using lime water.

The digestive system uses HCl; antacids are used to neutralize excess acid.

Salts having the same positive or negative radicals (e.g., NaCl and Na₂SO₄ share Na⁺) are considered to belong to the same family.

Tooth decay starts when the mouth’s pH is less than 5.5, which damages tooth enamel.

The methanoic acid from stings can be neutralized by applying mild bases like baking soda.

Plaster of Paris (POP) is used for setting fractured bones.

Because the process is exothermic, acid must always be added slowly to water, and never water to the concentrated acid.

Bleaching Powder (Ca(ClO)₂) is prepared by reacting Cl₂ with slaked lime (Ca(OH)₂).

Acids and bases ionise only in aqueous solution; dry HCl gas requires water to produce the H⁺ ions necessary for acidity.

Bases that are soluble in water are specifically called alkalis.

Weak acid + strong base yields a basic salt.

This is the definition of water of crystallisation.

Dilution reduces the concentration of H⁺ or OH⁻ ions per unit volume.

Acids react with metals to form a salt and hydrogen gas (H₂).

Metallic oxides react with acids to form salt and water, indicating they behave as basic oxides.

Baking Soda (NaHCO₃) decomposes when heated to yield Sodium Carbonate (Na₂CO₃), CO₂, and H₂O.