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Chem Unit 3 > hard water > Flashcards

hard water Flashcards

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1
Q

what is scum

A

calcium or magnesium stearate

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2
Q

what causes hard water

A

calcium2+ or magnesium2+ ions dissolved in water

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3
Q

how is hard water softened

A

by the removal of Ca2+ or Mg2+

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4
Q

3 methods of softening

A
  • washing soda, sodium carbonate
  • ion exchange columns, Ca2+/Mg2+ replaced with Na+ or H+ ions
  • distillation- dissolved compounds left in flask
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5
Q

definition of hard water

A

hard water is water that does not readily lather with soap but instead produces scum

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Chem Unit 3 (16 decks)

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