How is salt extracted from the ground?
- drilled, blasted and dug out and brought to the surface by machinery
- solution mining
Why is it important to fill holes after mining?
-land could collapse and slide into holes (subsidence)
What are the useful products of the electrolysis of brine?
- hydrogen gas
- chlorine gas
- sodium hydroxide
How is sodium chloride solution (concentrated brine) electrolysed?
-electrodes made of inert materials, so they don’t react with the electrolyte or products
1-brine enters
2-at cathode two hydrogen ions accept one electron each to become on hydrogen molecule
3-at anode two chloride ions lose one electron to become one chlorine molecule
What are the uses of the products of the electrolysis of brine?
- hydrogen gas:make ammonia and margarine
- chlorine: disinfect water, make plastic and solvents and hydrochloric acid
- sodium hydroxide:used to make soap, can be reacted with chlorine to make household bleach
What is solution mining?
- pumping hot water underground
- salt dissolves and salt solution is forced to surface by pressure of the water
Why is the chloro-alkali industry important for the economy?
- may uses of the products from reaction
- lots of new products can be made and lots of jobs created
