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pH Scale Explorer - Online Interactive Acid Base Chart

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pH Scale Explorer

Interactive Acid-Base Chart – Click, drag or slide to discover the pH world.

ACID NEUTRAL BASE
0123456 7891011121314
Selected pH: 7.0

Type: Neutral

Closest example: Pure water

Indicator Color
What is pH?

pH measures how acidic or basic a solution is. The scale runs from 0 (most acidic) to 14 (most basic), with 7 as neutral.

Acid vs Base

Acids donate H⁺ ions (pH < 7) and taste sour. Bases accept H⁺ ions (pH > 7) and feel slippery. Both are essential in everyday chemistry.

Common pH Values

Lemon juice (pH 2), coffee (pH 5), milk (pH 6.5), pure water (pH 7), baking soda (pH 9), bleach (pH 13).

Frequently Asked Questions

pH stands for "potential of Hydrogen". It is a logarithmic scale used to specify the acidity or basicity of an aqueous solution.

pH affects countless processes – from enzyme activity in your body to plant growth in soil. It is essential in medicine, agriculture, water treatment and cooking.

pH is measured using indicators (litmus, universal indicator), pH test strips, or electronic pH meters. This interactive tool mimics universal indicator colours.

A universal indicator is a mixture of dyes that produces a rainbow of colours across the pH scale – red for strong acids, green for neutral, and purple for strong bases.

At 25°C, pure water has pH 7 and is neutral. However, neutrality depends on temperature – at 100°C, neutral pH is about 6.14. In everyday context, 7 is the neutral reference.

Drag the slider, click directly on the coloured bar, or tap one of the small white dots to instantly see the pH value, indicator colour, and an everyday example.
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