Flash Cards: Exploring Substances: Acidic, Basic, and Neutral

Acids are substances that release hydrogen ions (H⁺) in solution and have a pH less than 7.

Bases are substances that release hydroxide ions (OH⁻) in solution and have a pH greater than 7.

The pH scale ranges from 0 to 14, measuring the acidity or basicity of a substance.

Litmus paper is used to test whether a substance is acidic or basic; it turns red in acidic solutions and blue in basic ones.

Common acids include hydrochloric acid (HCl), sulfuric acid (H₂SO₄), and acetic acid (found in vinegar).

Common bases include sodium hydroxide (NaOH), potassium hydroxide (KOH), and calcium hydroxide (lime).

Neutralization is a chemical reaction between an acid and a base, producing salt and water.

Hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) to produce sodium chloride (table salt) and water.

Blue litmus paper turns red when exposed to an acidic solution.

Red litmus paper turns blue when exposed to a basic solution.

Other indicators include phenolphthalein (turns pink in basic solutions) and universal indicator (shows a range of colors).

Factors include the presence of acids or bases, dilution, and temperature.

pH is important for processes like digestion, soil health, and the functioning of aquatic ecosystems.

Always wear gloves and goggles, work in a well-ventilated area, and read labels before use.

A common mistake is assuming all bases are safe; some are very caustic and harmful.

Acids generally have a sour taste, while bases feel slippery and may taste bitter.

They can neutralize each other, often producing heat and forming water and salts.

Yes, all acids in aqueous solutions release hydrogen ions H⁺, which defines their acidic nature.