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a level chemistry > Chapter 20 > Flashcards

Chapter 20 Flashcards

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1
Q

What is a bronsted Lowry acid

A

Bronsted Lowry acid is a proton donor

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2
Q

What is a bronsted Lowry base

A

Bronsted Lowry base is a proton acceptor

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3
Q

What is a monobasic dibasic and tribasic acid

A

A monobasic acid can only released one proton a dibasic could release two and a tribasic can release 3

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4
Q

What are conjugate acid base pairs

A

Conjugate pairs and linked by the transfer of a proton the species that has lost a proton is a conjugate base and a species that is gaining a proton is a conjugate acid

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5
Q

Why is water a special case for conjugate acid base pairs

A

With acids water forms a conjugate acid where is with bases it forms a conjugate base

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6
Q

Describe the development of the acid-base theory

A

In 1754 Guillame said a base react with an acid to give a solid form
In 1884 Arhenius says acid forms h+ ions and bases form oh- ions
In 1923 bronsted Lowry says an acid donates a proton and a base accepts it

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7
Q

Acid + metal=

A

Acid + metal= salt + hydrogen

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8
Q

Acid + carbonate

A

Acid + carbonate= salt + water + carbon dioxide

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9
Q

Acid + base

A

Acid + base= salt + water

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10
Q

Acid + alkali

A

Acid + alkali=salt + water

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11
Q

What does pH measure

A

pH measures the concentration of hydrogen ions in solution

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12
Q

pH=

A

pH= -log|H+|

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13
Q

|H+|=

A

|H+|= 10^-pH

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14
Q

What assumption is made for strong acids

A

Concentration of acid is equal to concentration of h+ ions

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15
Q

What is the acid dissociation constant Ka

A

KA is the equilibrium constant that shows the extent of dissociation of a weak acid

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16
Q

Ka=

A

Ka= |H+| |A-| / |HA|

17
Q

What is PKa

A

PKa is a negative logarithm of Ka

18
Q

Ka=

In terms of pKa

A

Ka= 10-pKa

19
Q

pKa=

A

pKa=-logKa

20
Q

What is the difference between a strong acid and a weak acid

A

A strong acid completely dissociates and a weak acid partially dissociates

21
Q

What approximations are made with weak acids

A

H A produces equal concentrations of h plus and a minus
Ha is larger than H+
The dissociation of water is negligible

22
Q

In weak acids Ka=

A

Ka= |H+|^2/ |HA|

23
Q

What is the ionic product of water kW

A

kW is the product of ions formed in the partial dissociation of water

24
Q

kW=

A

kW= |H+| |OH-|

25
Q

What is kw at 25 degrees

A

kW= 1x10-14 mol2dm-6

26
Q

Does temperature affect kW

A

Temperature varies the value of kW

27
Q

Does concentration affect kW

A

Concentration affect kW

a level chemistry (21 decks)

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