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Chemistry mistakes > C3 2021 > Flashcards

C3 2021 Flashcards

1
Q

Sodium ethanedioate is toxic, suggest safety precautions for filling the burette and dissolving the solid

A

Below eye level
Wear gloves

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2
Q

State the colour change seen at the end point of each titration

A

Colourless to pink

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3
Q

Give two practical steps needed before recording the initial burette reading

A

Remove funnel
No air bubbles

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4
Q

Describe how the crystalline solid is separated and purified

A

Filter
Dissolve in minimum volume of hot solvent
Cool and filter
Wash with cold solvent and dry

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5
Q

Why is KCN used instead of HCN?

A

HCN is weak

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6
Q

Equation for solid sodium bromide with conc sulfuric acid

A

2NaBr + 2H2SO4 -> Na2SO4 + SO2 + Br2 + 2H2O

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7
Q

WHat does HNO3 do in group 7

A

Removes any ions that may give other ppt with AgNO3

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8
Q

Give equation for dilute aq ammonia with silver chloride

A

AgCl + 2NH3 -> Ag(NH3)2+ + Cl-

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Chemistry mistakes (33 decks)

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