Flashcards in C2h Deck (7):
How is salt extracted from the ground?
-drilled, blasted and dug out and brought to the surface by machinery
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?
How is sodium chloride solution (concentrated brine) electrolysed?
-electrodes made of inert materials, so they don't react with the electrolyte or products
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