U1-1-3 - Redox Titrations Flashcards

Part of the Oxidising and Reducing Agents topic from Unit 1 of Higher Chemistry, Chemical Changes and Structure

1
Q

Standard solution

A

A solution of accurately known concentration

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2
Q

Procedure for preparing a standard solution:
* ________________________________
* add to volumetric flask with rinsings
* fill up to mark with water.

A

Procedure for preparing a standard solution:
* dissolve solid in small volume of water
* add to volumetric flask with rinsings
* fill up to mark with water.

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3
Q

Procedure for preparing a standard solution:
* dissolve solid in small volume of water
* ____________________________________
* fill up to mark with water.

A

Procedure for preparing a standard solution:
* dissolve solid in small volume of water
* add to volumetric flask with rinsings
* fill up to mark with water.

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4
Q

Procedure for preparing a standard solution:
* dissolve solid in small volume of water
* add to volumetric flask with rinsings
* __________________________.

A

Procedure for preparing a standard solution:
* dissolve solid in small volume of water
* add to volumetric flask with rinsings
* fill up to mark with water.

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5
Q

Self-indicating reaction

A

A reaction involving a reactant which changes colour to show the endpoint.

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6
Q

If permanganate is used as a titrant, what is the colour change seen during the titration (as the endpoint is reached)?

A

Colourless to purple

(permanaganate ions are purple, but before the endpoint they will keep getting converted into colourless Mn2+ ions)

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7
Q

Concordant titres

A

Titres within 0.2 cm3 of each other

(e.g. 17.2 and 17.4 are concordant)

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8
Q

Where do n1 and n2 come from?

A

Balanced equation - NOT calculated using n=cV!

E.g. in the equation shown, n1 (Fe2+) = 6, n2 (Cr2O72-) = 1

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9
Q

Suggest an improvement

A

Read burette at eye level

Use a white tile

Remove funnel from burette

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10
Q

Suggest what you would use to accurately measure 10 cm3 of solution

A

Pipette

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11
Q

Procedure to prepare a burette for titration:
* ____________________________
* remove filter funnel
* open tap to release air bubbles
* read scale from bottom of meniscus.

A

Procedure to prepare a burette for titration:
* rinse with solution which will be added to the burette (NOT water)
* remove filter funnel
* open tap to release air bubbles
* read scale from bottom of meniscus.

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12
Q

Procedure to prepare a burette for titration:
* rinse with solution which will be added to the burette (NOT water)
* remove ____________
* open tap to release air bubbles
* read scale from bottom of meniscus.

A

Procedure to prepare a burette for titration:
* rinse with solution which will be added to the burette (NOT water)
* remove filter funnel
* open tap to release air bubbles
* read scale from bottom of meniscus.

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13
Q

Procedure to prepare a burette for titration:
* rinse with solution which will be added to the burette (NOT water)
* remove filter funnel
* open tap to ____________________
* read scale from bottom of meniscus.

A

Procedure to prepare a burette for titration:
* rinse with solution which will be added to the burette (NOT water)
* remove filter funnel
* open tap to release air bubbles
* read scale from bottom of meniscus.

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14
Q

Procedure to prepare a burette for titration:
* rinse with solution which will be added to the burette (NOT water)
* remove filter funnel
* open tap to release air bubbles
* read scale from _______________________.

A

Procedure to prepare a burette for titration:
* rinse with solution which will be added to the burette (NOT water)
* remove filter funnel
* open tap to release air bubbles
* read scale from bottom of meniscus.

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15
Q

What indicator should be used in a titration involving iodine?

A

Starch

turns blue-black in the presence of iodine

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16
Q

Procedure to prepare a pipette for measurement:
* rinse pipette with ________________
* fill to above volume mark and run down to mark
* read scale from bottom of meniscus.

A

Procedure to prepare a pipette for measurement:
* rinse pipette with solution to be measured
* fill to above volume mark and run down to mark
* read scale from bottom of meniscus.

17
Q

Procedure to prepare a pipette for measurement:
* rinse pipette with solution to be measured
* fill to ________________ and run down to ________
* read scale from bottom of meniscus.

A

Procedure to prepare a pipette for measurement:
* rinse pipette with solution to be measured
* fill to above volume mark and run down to mark
* read scale from bottom of meniscus.