Water for Life

1) Chlorine tablets, distillation and filtration. In terms of cost, a good filter bottle or straw may be more costly as compared to distillation and the chlorine tablets. Chlorine tablets can be easily bought from convenience stores and distillation can be easily done using a portable stove and a messtin. In terms of effectiveness, a good filter may be the best option to purify water as it is able to filter out bigger unwanted particles and kill bacteria. However, it needs to be regularly replaced. Using all three methods will be the most effective in killing pathogenic bacteria and purifying water.

Similar methods used in purifying municiple water supplies are chlorination, distillation and filtration.

2) Desalination is more costly and energy intensive. It is usually done by energy rich countries.

3)

a) Corroded water pipes or pipe soldering using lead.

b) It is possible if irresposible acts lead to lead leakage into the drinking water pipes. However in most cases, the drinking water pipes are not connected to the water drainage system.

4) Water soluble vitamins are polar. They are able to form hydrogen bonds with water molecules.

Fat soluble vitamins are non-polar. They are hydrophobic and dissolve in other non-polar substances.