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Chemistry core practicals > CPAC 03 > Flashcards

CPAC 03 Flashcards

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1
Q

State the method to find the concentration of hydrochloric acid with sodium hydroxide

A
  • wash out 250cm3 volumetric flask with distilled water
  • add 25cm3 of hydrochloric acid using pipette into volumetric flask and make solution up to 250cm3 with distilled water
  • prepare titration apparatus: burette containing sodium hydroxide and conical flask containing hydrochloric acid solution
  • pour 25cm3 aliquot of hydrochloric acid solution into the flask, add 2 drops of phenolphthalein
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2
Q

Why does phenolphthalein go back to colourless from pink when left?

A

excess sodium hydroxide reacts with CO2 in air to form sodium carbonate

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3
Q

What is the equation for sodium hydroxide with carbon dioxide?

A

2NaOH + CO2 –> Na2CO3 + H2O

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4
Q

Are larger or smaller titres better?

A

larger titres are better as there is a smaller percentage uncertainty

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Chemistry core practicals (4 decks)

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