SODIUM CHLORID Martina Sigetová Silvie Kolibačová

Properties Chemical compound with the formula NaCl Chemical compound with the formula NaCl Common salt, table salt or halite Common salt, table salt or halite With an ionic bond and electrostatic forces With an ionic bond and electrostatic forces Crystal structure with cubic symmetry Crystal structure with cubic symmetry

History Roman soldiers were at certain times paid with salt Roman soldiers were at certain times paid with salt roads were built to make transportation of salt to the capital city roads were built to make transportation of salt to the capital city Salt has played a prominent role in determining the power and location of the world's great cities Salt has played a prominent role in determining the power and location of the world's great cities

Occurrence Seawater (Dead Sea) Seawater (Dead Sea) Salt lakes Salt lakes Brine Brine Mining rock salt – halite Mining rock salt – halite Brine – soľanka Mining - ťažba

Synthetic uses To produce chlorine, PVC, pesticides To produce chlorine, PVC, pesticides 2NaCl + 2H2O → Cl2 + H2 + 2NaOH 2NaCl + 2H2O → Cl2 + H2 + 2NaOH (electrolysis of sodium chloride dissolved in water) (electrolysis of sodium chloride dissolved in water) Solvay proces – to produce sodium carbonate, calcium chloride Solvay proces – to produce sodium carbonate, calcium chloride

Food uses Flavour enhancer Flavour enhancer Preservative for food Preservative for food Negative: increased hear attack Negative: increased hear attack blood pressure (hypertension) blood pressure (hypertension) dehydrate the human body dehydrate the human body Enhancer – zlepšovač chuti

Biological uses Water is drawn out cells by osmosis - preserve some food Disinfect wounds Cleansing agent Wound – rana Draw out - odoberať

Halite Mineral form of NaCl – rock salt Mineral form of NaCl – rock salt colourless to yellow, but may also be light blue, dark blue, and pink colourless to yellow, but may also be light blue, dark blue, and pink

Road salt De-icing: solution of table salt in water, the freezing temperature becomes -21 °C De-icing: solution of table salt in water, the freezing temperature becomes -21 °C Common chemicals: sodium chloride and calcium chloride are very similar and effective in de-icing roads Common chemicals: sodium chloride and calcium chloride are very similar and effective in de-icing roads Additives: potassium iodide - iodized salt to reduce simple goiter Additives: potassium iodide - iodized salt to reduce simple goiter Additives – prídavné látky Goiter - struma

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