Flashcards in C2h-chemicals From The Sea:sodium Chloride Deck (19)
What is solution mining?
Pumping hoy water underground
Salt solution forced to surface by pressure of water
How can mining for salt lead to subsidence?
If holes dug out after mining are not filled
Leads to land collapsing and sliding into hole
What are the 2 methods of extracting salt?
Mined as rock salt
What is the test for chlorine?
It bleaches damp litmus paper
What are the products of the electrolysis of concentrated sodium chloride solution (brine)?
Why are inert electrodes used in the electrolysis of sodium chloride solution?
So they won't react with the electrolyte or the products of electrolysis
What ions does sodium chloride solution contain?
What happens at the cathode?
Two hydrogen ions accept one electron each to become one hydrogen molecule
Hydrogen is made
What happens at the anode?
Two chloride ions lose one electron each to become one chlorine molecule
Chlorine is made
What is the half equation for the reaction at the cathode?
2H+ + 2e --> H2
What is the half equation for the reaction at the anode?
2Cl- - 2e --> Cl2
How is sodium hydroxide formed?
Ions left in solution form sodium hydroxide
What is sodium chloride used as?
What is sodium chloride a source of?
What is chlorine used for?
What is hydrogen used for?
What is sodium hydroxide used for?
How is household bleach made?
Sodium hydroxide reacted with chlorine
Sodium hydroxide + chlorine--> sodium chloride + water+ sodium chlorate