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pH values of common substances
| pH value |
Acidic
solutions |
pH value |
Alkaline
solutions |
| 1 |
0.1 N HCl |
7.3 |
Blood (Human) |
| 2.3 |
Citric acid (Lemons) |
7.9 |
Albumin (eggs) |
| 3 |
Carbonic acid (soft
drinks) |
8.5 |
Sea water |
| 3.5 |
Tartaric acid (grapes) |
10.5 |
Milk of Magnesia |
| 5.3 |
Boric acid (eye wash) |
11.6 |
0.1 N Na2CO3 solution |
| 6.6 |
Lactic acid (milk) |
13 |
0.1 N NaOH solution |
Utility of pH values
1) To determine the nature of solution
if pH = 7, then solution is neutral
pH > 7, then solution is alkaline
pH < 7, then solution is acidic
2) To compare the acidity and Basicity of two solutions.
3) For formulating drugs as some drugs are not stable at acidic pH.
4) In agriculture, to determine soil condition.
5) In Medicine pH values of blood and urine for diagnosis of various diseases.
6) In the chemical industry, as certain reactions take place at particular pH only.
7) In bio chemical processes, as enzymes are stable at a particular pH value.
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