SODIUM CHLORIDSODIUM CHLORID

Martina SigetováMartina Sigetová

Silvie KolibačováSilvie Kolibačová

PropertiesProperties

• Chemical compound with the formula Chemical compound with the formula NaClNaCl

• Common salt, table salt or haliteCommon salt, table salt or halite

• With an ionic bond and electrostatic With an ionic bond and electrostatic forcesforces

• Crystal structure with cubic Crystal structure with cubic symmetrysymmetry

HistoryHistory

• Roman soldiers were at certain times Roman soldiers were at certain times paid with salt paid with salt

• roads were built to make roads were built to make transportation of salt to the capital transportation of salt to the capital citycity

• Salt has played a prominent role in Salt has played a prominent role in determining the power and location determining the power and location of the world's great cities of the world's great cities

OccurrenceOccurrence

• Seawater (Dead Sea)Seawater (Dead Sea)

• Salt lakesSalt lakes

• BrineBrine

• Mining rock salt – haliteMining rock salt – halite

Brine – soľankaMining - ťažba

Synthetic usesSynthetic uses

• To produce chlorine, PVC, pesticidesTo produce chlorine, PVC, pesticides

• 2NaCl + 2H2O → Cl2 + H2 + 2NaOH 2NaCl + 2H2O → Cl2 + H2 + 2NaOH

(electrolysis of sodium chloride (electrolysis of sodium chloride dissolved in water)dissolved in water)

• Solvay proces – to produce sodium Solvay proces – to produce sodium carbonate, calcium chloridecarbonate, calcium chloride

Food usesFood uses

• Flavour enhancerFlavour enhancer

• Preservative for foodPreservative for food

• Negative: increased hear attackNegative: increased hear attack

blood pressure blood pressure (hypertension)(hypertension)

dehydrate the human bodydehydrate the human body

Enhancer – zlepšovač chuti

Biological usesBiological uses

• Water is drawn out cells by osmosisWater is drawn out cells by osmosis

- preserve some food- preserve some food

• Disinfect woundsDisinfect wounds

• Cleansing agent Cleansing agent

Wound – ranaDraw out - odoberať

HaliteHalite

• Mineral form of NaCl – rock saltMineral form of NaCl – rock salt

• colourless to yellow, but may also be colourless to yellow, but may also be light blue, dark blue, and pink light blue, dark blue, and pink

Road saltRoad salt

• De-icing: solution of table salt in De-icing: solution of table salt in water, the freezing temperature water, the freezing temperature becomes -21 °C becomes -21 °C

• Common chemicals: sodium chloride Common chemicals: sodium chloride and calcium chloride are very similar and calcium chloride are very similar and effective in de-icing roads and effective in de-icing roads

• Additives: potassium iodide - iodized Additives: potassium iodide - iodized salt to reduce simple goitersalt to reduce simple goiter

Additives – prídavné látkyGoiter - struma

Thank you for your attentionThank you for your attention