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Chemistry > Redox Titrations > Flashcards

Redox Titrations Flashcards

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1
Q

Standard Solution

A

A solution of known concentration

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2
Q

Properties of a primary standard

A

Pure
Water soluble
Solid
High molecular mass
Not oxidised by air
Does not effloresce (lose water of crystallisation)
Does not deliquesce (absorb water from air)

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3
Q

Why is it necessary to dilute sulfuric acid when preparing from hydrated ammonium iron(II) sulfate

A

To prevent air oxidation of the Fe2+ in solution

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4
Q

Why is it necessary to add more dilute sulfuric acid to each 25.0 cm3 portion of hydrated ammonium iron(II) sulfate

A

To ensure MnO4– reduces to colourless Mn2+

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5
Q

Colour Change of hydrated ammonium iron(II) sulfate

A

Purple to faint permanent pink colour

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6
Q

How is iodine brought into aqueous solution

A

Reacted with potassium iodide (KI)

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7
Q

Indicator for Iodine

A

Starch

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8
Q

When is the indicator added

A

When the solution in conical flask is light yellow near the end point

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9
Q

Colour Change of Starch in Iodine

A

Blue/Black to Colourless

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10
Q

Why distilled water instead of deionised water is used

A

Deionised water could contain non-ionic substances that could be oxidised or reduced

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11
Q

Colour Change of Bleach Titration

A

Red/brown to colourless

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12
Q

Why excess Potassium Iodide was used in Bleach Titration

A

So all the hypochlorite has reacted so the max iodine is produced
To keep the iodine in solution

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13
Q

Indicator for Bleach Titration

A

Starch

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14
Q

What is used to standardise the potassium manganate(VII) solution

A

ammonium iron(II) sulfate

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15
Q

Why is some dilute sulfuric acid added to the iron tablets

A

To prevent iron (II) being oxidised by air

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16
Q

Why is additional dilute sulfuric acid must be added to the iron titration

A

To ensure reduction of MnO4– to Mn2+

To prevent formation of Mn4+

17
Q

What must be added to pure iodine bring it into

aqueous solution

A

Potassium iodide

18
Q

Colour change of potassium iodide

A

Red/brown to light yellow to blue/black to colourless

Chemistry (26 decks)

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