pH Scale, Acids, and Bases

Front

What is the pH scale and what does it measure?

Back

The pH scale is a numerical scale ranging from 0 to 14 that measures the acidity or basicity of a solution. A pH of 7 is neutral, below 7 is acidic, and above 7 is basic (alkaline).

Front

What are acids and how do they affect litmus paper?

Back

Acids are substances that can donate protons (H+) in a solution. They turn blue litmus paper red.

Front

What are bases and how do they affect litmus paper?

Back

Bases are substances that can accept protons or donate hydroxide ions (OH-) in a solution. They turn red litmus paper blue.

Front

What is the pH level of a strong acid, such as hydrochloric acid?

Back

The pH level of a strong acid like hydrochloric acid is typically below 3.

Front

What is the pH level of a strong base, such as bleach?

Back

The pH level of a strong base like bleach is typically around 13.

Front

What is the relationship between pH and the concentration of hydrogen ions in a solution?

Back

The pH of a solution is inversely related to the concentration of hydrogen ions (H+); as the concentration of H+ increases, the pH decreases.

Front

What happens when an acid and a base are mixed together?

Back

When an acid and a base are mixed, they undergo a neutralization reaction, producing water and a salt, resulting in a pH-neutral solution.

Front

What is an example of a common household acid?

Back

Lemon juice is a common household acid, primarily due to its citric acid content.

Front

What is an example of a common household base?

Back

Baking soda (sodium bicarbonate) is a common household base.

Front

What is the significance of the pH level in biological systems?

Back

The pH level is crucial in biological systems as it affects enzyme activity, metabolic processes, and overall cellular function.