(21) Acids & pKa In Organic Chemistry Flashcards

1
Q

under what two conditions is a solution in equilibrium ?

A
  1. forward and backwards rate of reaction are equal

2. concentrations remain constant

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2
Q

what does pH measure

A

the acidity of a solution of acid DEPENDING on its concentration

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3
Q

what is pKa

A

the property of a compound that measures the ability to dissociate a proton

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4
Q

two factors that effect acid strength

A
  1. strength of A-H

2. stability of the conjugate base ( A- )

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5
Q

how does resonance effect the stability of an acid ?

A

stabilises the negative charge on the conjugate base, therefore making it more acidic

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6
Q

describe how inductive effects modify the strength of an acid ?

A
  1. anions with electron withdrawing groups attached ( F, Cl etc ) is stabilised
  2. this favours acid dissociation
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7
Q

define pH

A

the measure of hydrogen ion concentration

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8
Q

define pKa

A

is obtained by the ionisation constant of a molecule to identify the acid strength

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