dissolved gases in water provide softness to water? correct the statements
Answers
Answer:
dissolution of carbon dioxide oxide gas in water is changed.
Answer:
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Explanation:
All purified water is produced by removing impurities from natural or municipal waters. We need, therefore, to consider the gases possibly present in these feed-waters, their fates as the waters is purified and any potential contamination with the same or other gases during or after purification.
Gases in Natural Waters
Natural waters are, to a greater or lesser extent, in contact with air. Most of the dissolved gases are absorbed from the air plus CO2 which can come in part from soil and rocks in contact with the water. Municipal waters are obtained by treating natural waters to make them safe to drink. These processes tend to have very little effect on the dissolved gas content of the water, generally increasing their contact with ambient air and reducing the variability due to local sources.
Every atmospheric gas is in equilibrium with that gas dissolved in water. The amount dissolved in water depends on the temperature and the partial pressure of the gas in the atmosphere.
The molar concentration of a gas, i, dissolved in water in contact with air is given by:
[gasi(aq)] = Pi/KH where Pi is its volume proportion in air and KH is its equilibrium constant.
Typical percentages of gases in air, their equilibrium constants with water and the resulting concentrations in water in contact with air
Gas
Volume
KH
Concentration in Water at 25°C
Name
%
atm/Mole
mg/L
Nitrogen
78.08
1639.3
13.34
Oxygen
20.95
769.2
8.72
Argon
0.93
714.3
0.052
Neon
0.0018
2222.2
0.000016
Helium
0.0005
2702.7