Acids, Bases, and Salts Class 10

Pure water has a pH of 7, which is considered neutral. It is not an acid (pH < 7) or a base (pH > 7).

The pH scale ranges from 0 to 14. Substances with a pH greater than 7 are considered basic (alkaline).

Substances with a pH less than 7 are acidic. Lemons contain citric acid, which gives them a low pH.

A pH of 6.5 is slightly less than 7, making milk slightly acidic. While very close to neutral, it is classified as an acid.

Alkaline is the chemical term used to describe basic substances or solutions with a pH greater than 7.

pH stands for 'potential of hydrogen' and is a measure of the concentration of hydrogen ions (H+) in a solution.

A weak base is defined by its inability to fully dissociate into ions in a solution. It only partially breaks apart.

In chemistry, dissociation is the process by which compounds split into smaller particles, such as ions, when dissolved in a solvent.

Calcium is an element, not a salt. Salts are ionic compounds formed from the neutralization reaction of an acid and a base (e.g., calcium sulfate, table salt).

A salt is produced through a neutralization reaction where an acid reacts with a base to form water and an ionic salt compound.

Salts are ionic compounds, not covalent. Furthermore, the definition provided incorrectly swaps the roles of cations and anions.

Ammonia (NH3) acts as a weak base because it accepts a proton to form the ammonium ion (NH4+).

By the Arrhenius definition, a base increases the concentration of hydroxide ions (OH-) in an aqueous solution.

Vinegar contains acetic acid, aspirin is acetylsalicylic acid, and vitamin C is ascorbic acid.

Acids increase the concentration of hydrogen or hydronium ions (H+ or H3O+), not hydroxide ions (OH-).