Explain the universal indicator.
- The universal indicator is used to know the strength of acid or base.
- Universal indicator is a mixture of several indicators.
- It is a pH indicator made of a solution of several compounds that exhibits several smooth colour changes over wide range pH values to indicate the acidity or alkalinity of solutions
- The universal indicator shows different colours at different concentrations of hydrogen ions in a solution.
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- (a) What is a universal indicator? For what purpose is it used?(b) How does a universal indicator work?(c) Water is a neutral substance. What colour will you get when you add a few drops of universal indicator to test-tube containing water?
- When a student added universal indicator solution to one of the following chemicals, its colour changed to navy blue. The chemical is most likely to be :
- (a) What would you expect the pH of pure water to be?(b) What colour would the universal indicator show in an aqueous solution of sugar? Why?(c) A sample of rain water turned universal indicator paper yellow. What would you expect its pH to be? Is it a strong or a weak acid?
- In an experiment to measure the pH values of solutions, a student placed strips of universal indicator paper in four beakers containing solutions A, B, C and D. The colour of universal indicator paper in these solutions is as shown below :The solution having lowest pH value is:(1) A(2) B(3) C(4)D"
- Two Solution X and Y are tested the universal indicator. Solution X turns orange whereas solution Y turns red. Which of the solutions is a stronger acid?
- State the universal law of gravitation.
- Two solutions X and Y are tested with universal indicator. Solution X turns orange whereas solution Y turns red. Which of the solutions is a stronger acid?
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- What colour will universal indicator show if you add it to the following substances?(a) Potassium hydroxide, pH = 12 (b) Soda water, pH = 5(c) Sulphuric acid, pH = 2
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- A student was given four unknown solutions in test-tubes marked A, B, C and D and asked to test them with universal indicator solution. He observed that on putting universal indicator solution, the solutions A, B, C and D turned blue, orange, green and red respectively. The test-tube which contains sodium chloride solution is :(1) A (2) B (3) C (4) D
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