pH Scale and Soil pH Determination

Vocabulary-style flashcards defining the pH scale, specific pH levels for various substances, and the tools used to measure soil pH.

pH scale

A measure of the degree or acidity or alkalinity of a substance.

pH values range

The values range from $0$ to $14$.

Neutral solution

A solution with a pH of $7$, such as pure water.

Acidic solution

A solution with a pH value between $0$ and $7$. The lower the value, the stronger the acid.

Alkaline solution

A solution with a pH value between $7$ and $14$. The higher the value, the stronger the alkaline.

Normal human blood

A substance with a pH of $7.3$, meaning it is slightly alkaline.

Vinegar

An acidic substance with a pH of $2.25$.

Apple

An acidic substance with a pH of $3$.

Sea water

An alkaline substance with a pH of $8.2$.

Soil pH values

Values that vary from $4$ to $9$ depending on the sample.

Apparatus for determination of soil pH

Tools used including litmus paper, pH water, and BDH universal indicators.