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Chemistry Module 5 > Acids > Flashcards

Acids Flashcards

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1
Q

What is a Bronstead Laury acid?

A

Proton donor

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2
Q

What is a Bronstead Laury alkali?

A

Soluble base, OH-

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3
Q

What is Bronstead Laury base?

A

Proton acceptor

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4
Q

Define a salt

A

When H+ ions get replaced with metal or ammonium

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5
Q

What salts does sulfuric acid make?

A

Sulfate 6 salt

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6
Q

Define a monobasic acid

A

Has 1 H+ ion to dissociate

Eh. HCl

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7
Q

Define a dibasic acid

A

Has 2 H+ ions to dissociate

Eg. H2SO4

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8
Q

Define a tribasic acid

A

Has 3 H+ ions to dissociate

Eg. H3PO4

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9
Q

What is the PH equation?

A

PH=-log [H+]

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10
Q

Define a weak acid

A

Partially dissociates in water

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11
Q

What is the ka expression?

A

Ka = [H+][A-] ÷ [HA]

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12
Q

What are the 2 assumptions made when referring to ka?

A

[HA] doesn’t dissociate
[H+] = [A-]

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13
Q

What does a small pka equal?

A

Large ka therefore strong acid

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14
Q

What is kW?

A

Ionisation of water

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15
Q

Pure water is always neutral. What does neutral mean?

A

Concentration of H+ is equal to Concentration of OH-

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16
Q

Define a buffer

A

Solution which contains a weak acid and its conjugate bade pair

17
Q

What happens if you add hydrogen ion to body buffer solution?

A

[H+] will increase and react with HCO3 to form H2CO3 no change in PH

18
Q

What happens if you add OH to body buffer solution?

A

OH will react with H+ to form water the concentration of H+ decreases

H2CO3 + H > HCO3

Maintaining PH

19
Q

Name some properties of methyl orange

A

Red to orange at 3.2 to 4.4 PH

20
Q

Name some properties of phenolphthalein

A

Colourless to purple at 8.2 to 10.0 PH

21
Q

What indicator can you use for a strong acid/strong base?

A

Phenolphthalein and methyl orange

22
Q

What indicator will you use with a strong acid/weak base?

A

Methyl orange

23
Q

What indicator will you use for a weak acid/strong base?

A

Phenolphthalein

24
Q

What is the end point of the reaction?

A

When [HA] turns into A-

25
Q

What is the equivalence point?

A

When the colour change occurs

26
Q

What will happen to an indicator if you add OH- ?

A

H+ decreases
HA decreases to replace H+
A- will increase and go yellow

27
Q

What will happen to an indicator if you add H+ ?

A

H+ will increase
H+ + A- > HA
So HA increases so red appears

Chemistry Module 5 (2 decks)

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