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Chemistry WJEC GCSE Unit 1 > water (soft water + softening techniques) > Flashcards

water (soft water + softening techniques) Flashcards

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1
Q

soft water

A

easy to form lather

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2
Q

softening methods:

A

boiling, adding sodium carbonate, ion exchange column

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3
Q

adding sodium carbonate (Na2CO3)

A

forms limescale.

Na2CO3 + CaSO4 = Na2SO4 + CaCO3

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4
Q

ion exchange column

A

uses a sodium ion resin

sodium ions exchange places with calcium ions

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5
Q

how is an ion exchange column regenerated?

A

flushed with concentrated sodium carbonate solution

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Chemistry WJEC GCSE Unit 1 (16 decks)

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