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iGCSE Chemistry > 5.1 Moles 2 > Flashcards

5.1 Moles 2 Flashcards

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1
Q

What is volume of gas measured in?

A

cubic metres

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2
Q

What is volume of gas measured in for mole calulations?

A

cubic decimetres

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3
Q

What is the scale factor between cm cubed and dm cubed?

A

1000

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4
Q

cubic centimetres -> cubic decimetres

A

divide by 1000

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5
Q

cubic decimetres -> cubic centimetres

A

multiply by 1000

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6
Q

Equation for moles of a gas?

A

moles = volume / 24 cubic decimetres

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7
Q

State the equation linking moles, volume and concentration

A

moles = concentration x volume

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8
Q

What is the concentration of a solution a measure of?

A

how much solute dissolved per unit volume

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9
Q

What is the equation for concentration of a solution?

A

concentration = moles / volume

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10
Q

What is titration used for?

A

neutralise a particular volume (acid/alkali)

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11
Q

Name the two special pieces of equipment for titration

A

volumetric pipette
burette

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12
Q

What is the volumetric pipette for?

A

measuring 25cm cubed accurately

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13
Q

What is the burette for?

A

measuring a volume to the nearest 0.05 cm cubed

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14
Q

Why is universal indicator not used in titration?

A

colour change is not sharp/defined

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15
Q

Which indicator should be used in titration?

A

phenolphthalein/methyl orange

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16
Q

Why is a pipette not suitable for adding acid/alkali to complete neutralisation?

A

pipette only measures on volume - 25 cm cubed

17
Q

What are concordat results?

A

differ from each other by 0.2 cm cubed or less

18
Q

What is the first step of set up for titration?

A

use volumetric pipette
25 cm cubed of unknown into conical flask

19
Q

Where does the 25 cubic cm of unknown go in step 1?

A

conical flask

20
Q

What is added to the conical flask in step 2?

A

indicator

21
Q

What is the burette filled with in step 3 of set up?

A

known solution

22
Q

Where should the burette of known solution be clamped?

A

above the conical flask

23
Q

In step 1 of usage, what should the volume of known be measured to?

A

nearest 0.05 cubic cm

24
Q

What is the role of the burette in step 2 of usage?

A

add known solution to conical flask

25
Q

How should the known solution be added to the acid?

A

drop-by-drop, swirling the flask

26
Q

When should the burette tap be closed?

A

colour change in conical flask

27
Q

How do you calculate titre?

A

final volume - initial volume

iGCSE Chemistry (17 decks)

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