Prelab Brief
To determine the pH of given samples using pH paper / universal indicator and to classify them as acidic, basic, or neutral.
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Theory
Measure pH of various solutions using a digital pH meter and indicator colours. To determine the pH of given samples using pH paper / universal indicator and to classify them as acidic, basic, or neutral.
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Formula
pH = 7 are neutral
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Aim
To determine the pH of given samples using pH paper / universal indicator and to classify them as acidic, basic, or neutral.
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Apparatus
- pH paper / Universal indicator strips
- Test tubes and test tube stand
- Dropper
- Sample solutions: HCl, NaOH, Lemon juice, Soap solution, Salt solution, Distilled water
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Procedure
- Take small amounts of each sample in separate test tubes.
- Dip pH paper strip into each solution.
- Compare the colour change with the standard pH colour chart.
- Record the pH value for each solution.
- Classify each solution as acidic (pH < 7), neutral (pH = 7), or basic (pH > 7).
Pre-Lab Questions
What is the main aim of the pH Scale & Indicators Experiment?
Which principle is demonstrated in the pH Scale & Indicators Experiment?
What apparatus is required for this experiment?
Why is pH paper / Universal indicator strips used in this experiment?
What formula or relationship is verified in this experiment?
What precaution should be followed while performing this experiment?
What conclusion can be drawn from the pH Scale & Indicators Experiment?