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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
Fill in the blank in the following sentences:
Those substances whose smell (or odour) changes in acidic or basic solution are called .......................... indicators.
Why does tooth decay start when the pH of mouth is lower than 5.5?
Name the scientist who developed the pH scale.
What is the name of the indicator which can be used for testing the pH of a solution?
Two solutions X and Y have pH = 4 and pH = 8, respectively. Which solution will give alkaline reaction and which one acidic?
(b) Name the acid or alkalis used to make (i) car batteries (ii) explosives (iii) soaps (iv) fertilisers.
Name two common antacids.
Separate the following into substances having pH values above and below 7. How do these influence litmus paper?
(i) Lemon juice
(ii) Solution of washing soda
(iii) Toothpaste
(iv) Vinegar
(v) Stomach juices
Someone put some universal indicator paper into vinegar. The pH is 3. What does this tell you about the vinegar?
The colour of methyl orange indicator in a solution is yellow. The pH of this solution is likely to be:
(a) 7
(b) less than 7
(c) 0
(d) more than 7
