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To find pH of a sample using universal indicator - Lab Experiment, Class 10, Science Video Lecture

FAQs on To find pH of a sample using universal indicator - Lab Experiment, Class 10, Science Video Lecture

1. How can I find the pH of a sample using universal indicator?
Ans. To find the pH of a sample using universal indicator, you need to first acquire a small amount of the sample and place it in a clean container. Then, add a few drops of universal indicator solution to the sample. Observe the color change that occurs in the solution. Compare the color obtained with the color chart provided with the universal indicator. The color chart corresponds to different pH values, allowing you to determine the pH of the sample based on the color change.
2. What is universal indicator?
Ans. Universal indicator is a chemical solution that is used to determine the pH of a substance. It is a mixture of several different indicators, such as phenolphthalein, methyl orange, and bromothymol blue. These indicators change color at different pH levels, and when combined in the universal indicator solution, they provide a broad range of colors that can be matched with the pH scale.
3. Why is it important to determine the pH of a sample?
Ans. Determining the pH of a sample is important because it provides information about the acidity or alkalinity of the substance. pH is a measure of the concentration of hydrogen ions in a solution, and it influences various chemical reactions and biological processes. For example, knowing the pH of soil is important for determining its suitability for certain plants. In the human body, pH balance is crucial for proper functioning of enzymes and maintaining homeostasis.
4. What are the different pH values indicated by universal indicator?
Ans. The universal indicator provides a range of colors that correspond to different pH values. Generally, the colors and their respective pH ranges are as follows: - Red: pH 0-3 - Orange: pH 3-5 - Yellow: pH 6-7 - Green: pH 7-9 - Blue: pH 10-12 - Purple: pH 12-14 These colors can vary slightly depending on the specific brand of universal indicator used.
5. Can universal indicator be used to determine the pH of any substance?
Ans. Universal indicator can be used to determine the pH of most aqueous solutions, including household liquids like lemon juice, vinegar, and milk. However, it may not be suitable for non-aqueous substances or substances that contain strong acids or bases. In such cases, other specialized pH indicators or measurement techniques may be required.
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