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Question
Distinguish between acid and alkali (other than indicators).
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Solution 1
An acid is that substance which gives H+ ions when dissolved in water.
An alkali is that substance which gives OH− ions when dissolved in water.
Solution 2
Acids: Have a sour taste.
Alkalis: They have a Sharp bitter taste, and they are soapy to the touch.
RELATED QUESTIONS
What do you understand by an alkali?
Give one example in the following case:
A basic oxide which is soluble in water.
Give one example in the following case:
An oxide which is a base.
Give one example in the following case:
A base which does not contain a metal ion.
Main constituent of base is ______.
Match the important chemicals given in Column (A) with the chemical formulae given in Column (B)
| Column (A) | Column (B) |
| (a) Plaster of Paris | Ca(OH)2 |
| (b) Gypsum | CaSO4. 1/2 H2O |
| (c) Bleaching Powder | CaSO4.2H7O |
| (d) Slaked Lime | CaOCl2 |
A solution changes the colour of turmeric indicator from yellow to red. The solution is ______.
On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?
Match the following:
| 1. | Sulphuric acid | a. | Weak base |
| 2. | Sodium hydroxide | b. | Strong acid |
| 3. | Acetic acid | c. | Strong base |
| 4. | Ammonium hydroxide | d. | Weak acid |
All bases are alkalis but all alkalis are not bases.
