Class 10 Exam > Class 10 Videos > To find pH of a sample using universal indicator - Lab Experiment, Class 10, Science
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.
Text Transcript from Video
pH Determination
The pH of a solution is defined as the negative
logarithm of its hydrogen ion concentration
in gram moles per litre.
It helps to point out whether the given substance
is acidic, alkaline or neutral.
pH is measured on a scale of 0 to 14.
The pH of - a neutral solution is 7, acidic
solution is less than 7 and alkaline solution
is greater than 7.
pH value of a solution can be determined using
a pH paper or Universal indicator solution
that have a broad range of indicators exhibiting
several smooth colour changes over a very
wide range of pH values.
Our aim here is find the pH of the given samples
using pH paper and universal indicator solution.
Materials required:
Solution of Sodium Bicarbonate, 0.1Molar HCl,
Common salt solution, pH paper, universal
indicator solution, White tile and dropper.
Procedure:
Take a strip of pH paper and place it on a
tile.
Now take a drop of common salt solution from
the beaker using a dropper and pour it over
the pH paper placed on the tile.
Observe the colour produced and compare it
with the different colour shades of the standard
colour pH chart and note down the pH value.
Now take a fresh dropper and take 1 drop of
universal indicator solution and add it into
the common salt solution taken in the beaker.
Observe the colour produced and compare it
with the different colour shades of the indicators
given on the universal indicator bottle and
again find out the pH value of the solution.
We can observe that in both the tests, the
pH value of common salt is 7.
Repeat the same step for finding out the pH
value of Sodium Bicarbonate solution and 0.1Molar
HCl using fresh strips of pH paper, universal
indicator and separate fine droppers for every
sample.
Through these methods, we can determine the
pH value of 0.1Molar HCl and pH value of sodium
bicarbonate.
The pH value of 0.1Molar HCl is 1 and that
of sodium bicarbonate is 9.
Precautions:
If you are using the same dropper for the
test of all samples, ensure that it has been
properly washed with water after every test.
Make sure that the pH strips are away from
the chemical fumes.
The pH of a solution is defined as the negative
logarithm of its hydrogen ion concentration
in gram moles per litre.
It helps to point out whether the given substance
is acidic, alkaline or neutral.
pH is measured on a scale of 0 to 14.
The pH of - a neutral solution is 7, acidic
solution is less than 7 and alkaline solution
is greater than 7.
pH value of a solution can be determined using
a pH paper or Universal indicator solution
that have a broad range of indicators exhibiting
several smooth colour changes over a very
wide range of pH values.
Our aim here is find the pH of the given samples
using pH paper and universal indicator solution.
Materials required:
Solution of Sodium Bicarbonate, 0.1Molar HCl,
Common salt solution, pH paper, universal
indicator solution, White tile and dropper.
Procedure:
Take a strip of pH paper and place it on a
tile.
Now take a drop of common salt solution from
the beaker using a dropper and pour it over
the pH paper placed on the tile.
Observe the colour produced and compare it
with the different colour shades of the standard
colour pH chart and note down the pH value.
Now take a fresh dropper and take 1 drop of
universal indicator solution and add it into
the common salt solution taken in the beaker.
Observe the colour produced and compare it
with the different colour shades of the indicators
given on the universal indicator bottle and
again find out the pH value of the solution.
We can observe that in both the tests, the
pH value of common salt is 7.
Repeat the same step for finding out the pH
value of Sodium Bicarbonate solution and 0.1Molar
HCl using fresh strips of pH paper, universal
indicator and separate fine droppers for every
sample.
Through these methods, we can determine the
pH value of 0.1Molar HCl and pH value of sodium
bicarbonate.
The pH value of 0.1Molar HCl is 1 and that
of sodium bicarbonate is 9.
Precautions:
If you are using the same dropper for the
test of all samples, ensure that it has been
properly washed with water after every test.
Make sure that the pH strips are away from
the chemical fumes.
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