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प्रश्न
Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain.
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उत्तर
- We know that basic and neutral solutions do not change the colour of blue litmus paper. Since blue litmus remains blue after dipping in the solution, the solution is either basic or neutral in nature.
- Put a drop of this solution on a red litmus paper. If it turns blue, the above solution is basic in nature. If no colour change occurs, it is neutral.
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संबंधित प्रश्न
The property which is not shown by acids is:
(a) they have sour taste
(b) they feel soapy
(c) they turn litmus red
(d) their pH is less than seven
What is the name of the indicator which can be used for testing the pH of a solution?
Two solutions A and B have pH values of 3.0 and 9.5 respectively. Which of these will turn litmus solution from blue to red and which will turn phenolphthalein from colourless to pink?
Explain how pH change in the lake water can endanger the lives of aquatic animals (like fish). What can be done to lessen the danger to the lives of aquatic animals in the lake?
The pH values of six solutions A to F are given below:
A = 0, B = 11, C = 6, D = 3, E = 13, F = 8
Which of the above solutions are (i) acids (ii) alkalis?
A sample of rain water turned universal indicator paper yellow. What would you expect it pH to be? Is it a strong or a weak acid?
Fresh milk has a pH of 6. When milk changes into curd, the pH value will:
(a) become 7
(b) become less than 6
(c) become more than 7
(d) remain unchanged
How will you prepare natural indicator from turmeric powder?
State whether the following statement is true or false. Correct the false statement.
Phenolphthalein is a natural indicator.
What is the colour of phenolphthalein in the basic solution?
