Indicator

The video tutorial explains how to measure the pH of a test material. It covers the use of litmus paper for a basic indication of acidity or alkalinity and describes how a universal indicator can show a range of colors based on acidity levels. For precise pH measurement, the video suggests comparing the indicator's color with a color chart.

What does pH measure in a test material?

• The density of the material

• The acidity or alkalinity of the material

• The color of the material

• The temperature of the material

How does litmus paper help in testing a substance?

• It provides a numerical pH value

• It indicates if a substance is acidic or alkaline

• It measures the temperature

• It shows the density of the substance

What is the role of a universal indicator?

• To indicate the density of a solution

• To provide a digital pH reading

• To display a range of colors based on acidity

• To measure the temperature of a solution

How can an accurate pH measurement be obtained?

• By using a litmus paper

• By using a thermometer

• By comparing the indicator with a color chart

• By weighing the substance

What does a universal indicator do that litmus paper does not?

• It indicates the density of a solution

• It provides a numerical pH value

• It measures temperature

• It displays a range of colors for different pH levels