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प्रश्न
The label on the bottle of chemical is spoiled. How will you find whether the chemical is acidic or not?
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उत्तर
The chemical is acidic or not checked in two ways:
- By use of litmus paper:
- If the given solution is acidic, it turns blue litmus to red litmus.
- If the given solution is basic, it turns red litmus to blue litmus.
- If the given solution is neutral, there is no effect on litmus paper.
- By use of indicators:
- If the given solution is acidic, it turns methyl orange to red.
- If the given solution is basic, it turns methyl orange to yellow.
- If the given solution is neutral, there is no effect on methyl orange indicator.
संबंधित प्रश्न
Tooth decay is caused by the presence of a base.
Name an indicator which is pink in alkaline solution but turns colourless in acidic solution.
Name the gas evolved when dilute HCl reacts with sodium hydrogencarbonate. How is it recognised?
What are organic acids?
What is the common name of water soluble bases?
Classify the following solutions as acids, bases or salts.
Ammonium hydroxide, barium chloride, sodium chloride, sodium hydroxide, H2SO4 and HNO3
State one observation for each of the following :
A small piece of zinc is added to dilute hydrochloric acid
Identify the following solutions, whether they are acid or base.
| Solution | Change in Indicator | Acid/Base | ||
| Litmus | Phenolphthalein | Methyl orange | ||
| 1. | -- | No change | -- | |
| 2. | -- | -- | Orange colour turns red | |
| 3. | Red litmus turns blue | -- | -- | |
Give the name and formula of two : Weak dibasic acids
Write the balanced equations for the reaction required to convert insoluble lead (II) oxide into insoluble lead chloride.
