Please answer #3. The answer to #2 is pH=5.187 2. Calculate the pH of water from

Question

Please answer #3. The answer to #2 is pH=5.187

2. Calculate the pH of water from a carbon dioxide concentration of 400 ppm (or 1.3 x 10M in water). Assume there are no other major acids or bases in the water. This is like distilled water in equilibrium with air today. 3. If the pH of some surface water or rain water is lower than what you calculated in problem #2, what can you assume about the chemistry of that water/rain? One answer is that it is not distilled water. So, what might be in the water to make the pH lower than the CO2 equilibrium pH?

Explanation / Answer

The ph lowered means the water has become acidic. Its is acidic water.

The reasons behind lowering of ph other than CO2(natural reason for acidity of water) are the man Made gaseous pollutants present in air, rain water reacts with nitrogen oxides and sulphur oxides released by mining industry, metallurgical industry, chemical industries etc forming respective acids like nitric acid and sulphuric acid which lower the Ph of water.

I,e SO3 + H2O -------> H2SO4

NO2 + OH. --------> HNO3.

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