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Chemistry > pH & Indicators > Flashcards

pH & Indicators Flashcards

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1
Q

Limitations of the pH scale

A

Limited to 0-14 range, even though pH values outside this are possible
Doesn’t work with very concentrated solutions
Limited to aqueous soln.

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2
Q

Strong acid

A

HCl

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3
Q

Strong base

A

NaOH

KOH (potassium hydroxide)

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4
Q

Weak acid

A

Ethanoic acid

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5
Q

Weak base

A

NH3

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6
Q

To find the pH of a weak acid (ethanoic acid)

A

[H+]= (Ka x M(acid))

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7
Q

Phenolphthalein colour change

A

Colourless—> pink

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8
Q

Methyl orange colour change

A

Red—>yellow

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9
Q

Litmus colour change

A

Red—>blue

Acid—>base

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10
Q

Acid-base indicator

A

A substance that changes colour according to the pH of the soln. It’s placed in

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11
Q

Range of an indicator

A

The pH interval over which there’s a clear change in colour for that indicator

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12
Q

What is Kw

A

The ionic product of water [H+][OH-]

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13
Q

pH of a neutral soln. is 7 at…

A

25 degrees

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14
Q

The stronger the acid…

A

The weaker the conjugate base

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15
Q

The weaker the acid…

A

The stringer the conjugate base

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16
Q

Indicators for titrating a strong acid(HCl) against a strong base(NaOH)?

A

Phenolphthalein (8-10)
methyl orange (3-5)
litmus (5-8)

17
Q

Indicator for titrating a strong acid(HCl) against a weak base(NH3) ?

A

Methyl orange (3-7)

The indicator has one colour at 3, and another at 7 this will identify the end-point accurately
Its range lies within the vertical line of the graph

18
Q

Indicator for a weak acid (ethanoic) against a strong base(NaOH)?

A

Phenolphthalein (8-10)

Its range lies iwthin the steep vertical lart of the graph

19
Q

Weak acid(ethanoic) vs. Weak base(NH3)

A

No suitable indicator—> no sudden increase in pH at any stage of titration
Not possobke to find the end point

20
Q

Self-ionisation of water

A

Water dissociates slightly to form ions H+, OH-

21
Q

What happens when an acid is added to water?

A

Imcreases conc. of H+ ions, value of OH- decreases

22
Q

What happens when a base is added to water?

A

Increases conc. of OH- ions, value of H+ decreases

Chemistry (12 decks)

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