If you add the valences of each atom in the molecular formula for arsenious acid, H 3 AsO 3, you can see that the molecule, which is uncharged, has a total valence state of 0 (3x(+1) for the hydrogen atoms; 1x(+3) for the arsenic(III) atom; 3x(-2) for the oxygen atoms = 3+3-6 = 0).
Eighty percent of sewage in India is untreated and flows directly into the nation's rivers, polluting the main sources of drinking water, a study by an environment watchdog showed Tuesday.
When our rivers, streams, lakes, groundwater, and oceans get polluted, it further cuts down the already limited amount we have available to share among us on this planet. This piece goes in depth on water pollution causes and solutions to hopefully inspire you to do your part to preserve this precious resource. What is Water Pollution? Water pollution occurs when contaminants infiltrate a body of water such as a lake, river, or ocean and hurt the quality of that water. A small amount of a contaminant may have little effect on a large body of clean water, but if there is a huge amount poured in or a small amount added each day over a long period of time, then it can become a major issue for many people.