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Control and Coordination
A measure of acidity or alkalinity of water soluble substance ( pH stands for potential of hydrogen). A pH value is a number from 1 to 14 with 7 as the middle (neutral) point. Values below 7 indicate acidity which increases as the number decrease, 1 being the most acidic values above 7 indicate alkalinity which increases as the number increase, 14 being the most alkaline. 
|
pH value |
Nature of solution |
|
0–2 |
Strongly acidic |
|
2–4 |
Moderately acidic |
|
4–7 |
Weakly acidic |
|
7 |
Neutral |
|
7–10 |
Weakly basic |
|
10–12 |
Moderately basic |
|
12–14 |
Strongly basic |
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Take 5 ml hydrochloric acid in a boiling tube or a conical flask. Add a few pieces of zinc granules to it.
(a) What do you observe on the surface of zinc granules?
(b) Name the gas evolved.
(c) What happens when the above gas is passed through soap solution?
(d) What happens when a burning candle is brought near the gas filled tube?
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