Universal Indicator

First note the colour shown by the indicator. Next match it with the pH chart. Then state whether the solution is acidic, neutral, or basic and how strong it may be.

A colour strip chart from red through green to purple is the best support for this concept.

A common wrong answer is to treat universal indicator like litmus and say it only shows acid or base. That misses the pH detail.

A universal indicator is a mixture of indicators that shows different colours for different pH values.

A universal indicator is a mixture of indicators that shows different colours for different pH values. Universal indicator gives a colour pattern across the pH scale, helping estimate whether a solution is acidic, neutral, or basic. A neutral solution may show green, while a basic solution may show blue or purple depending on its pH.

Universal indicator is useful when a student needs more information than simple litmus paper gives. It can show whether a solution is strongly acidic, weakly acidic, neutral, weakly basic, or strongly basic. The colour obtained can then be matched with a pH chart. This makes it a powerful tool for comparing solutions in the laboratory. Universal indicator gives a colour pattern across the pH scale, helping estimate whether a solution is acidic, neutral, or basic. A sample turns universal indicator green. From the chart, green indicates a neutral solution, so the sample is close to pH 7. Questions often ask which indicator gives a pH range, what colour appears at a given pH, or how to compare unknown samples using colour charts. A common wrong answer is to treat universal indicator like litmus and say it only shows acid or base. That misses the pH detail.