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What is the most significant factor in determining whether water is safe…
What is the most significant factor in determining whether water is safe to drink?
What makes some water dangerous?
Australian Drinking Water Guidelines (NHMRC, 2011)
Chemical Problems
Inorganic Chemicals
Heavy Metals & Metalloids
Inorganic anions & salts
Radionuclides
Organic Chemicals
General Pesticides
Herbocides
Fungocides
Insectocides
Pestocides
Organic Disinfectants
What is water?
Chemical Formula:
H₂O
Oxygen
Group 6 Period 2
Has 6 electrons in valence shell, creating -2 charge
Non-Metal
Hydrogen
Properties of Water
Polar Covalent Molecule
Polar Covalent Molecules means that each end of the compound has slightly opposite charges due to the different polarities of the atoms.
Covalent bonds are made between two non metals
Water dissolves atoms with higher polarity, mainly ionic compounds such as table salt (NaCl).
Liquid at Room Temperature
Melting Point 0C
Boiling Point: 100C