The colour of an acid solution varies, depending on its pH level.
Based on the provided reference, here's a breakdown of how acidity and colour correlate:
Acidic Solutions and Colour
| pH Level | Colour | Description |
|---|---|---|
| Acidic | Yellow to Red | Indicates an acidic solution. |
| Neutral | Green | Indicates a neutral solution. |
| Alkaline | Blue to Violet | Indicates an alkaline (or basic) solution. |
Therefore, the colours yellow to red are associated with acidic solutions. The exact shade of yellow, orange, or red depends on how acidic the solution is.
Practical Insight
- When testing the acidity of a solution using an indicator, you might notice that the colour gradually changes as you add an acid or a base. This allows for a more precise determination of the pH level. For example, strong acids would likely produce a redder colour, while weakly acidic solutions might show as yellow.
- The colour change helps to distinguish between the varying strengths of acids and bases.
