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Chem 105 > Lecture 12-3-2024 > Flashcards

Lecture 12-3-2024 Flashcards

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1
Q

pKa= -log (___)

A

ka

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2
Q

pKa tells us about _____ of acid/ base

A

strength

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3
Q

_______ Ka (stronger acid)

A

higher

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4
Q

pKa is _______ property substance

A

intrinsic

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5
Q

pH is property of ______-

A

solution

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6
Q

At pH < pKa, will be mostly ______

A

protonated

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7
Q

At pH > pKa, will be mostly

A

deprotonated

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8
Q

What is the equation for pH?

A

pH= -log10 [H+]

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9
Q

How do you calculate Ka?

A

[ product A] [product B]/ [reactant A]

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10
Q

What is the equation for percent dissociation?

A

amount dissociated / initial concentration

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11
Q

What is the equation for Kw?

A

Ka(Kb)= 14

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12
Q

What is the value of Kw?

A

1 x 10^-14

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13
Q

What cations will not have an affect on the pH?

A

Na+, K+, Ca ^2+
All alaki and alkaline metals

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14
Q

Why do other metal ions generally cause a decrease in pH?

A

Because they form a complex with water which makes it more acidic

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15
Q

An anion that is the conjugate base of _______ acid will not affect the pH

A

strong

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16
Q

An anion that is the conjugate base if a ______ acid will increase the pH

A

weak

17
Q

A cation that is the conjugate acid of a weak base will _______ the pH

A

decrease

18
Q

When a solution contains both the conjugate base of a weak acid and the conjugate acid of a weak base, the affect on the pH depends on the ____ and ____ values

A

Ka, and Kb

19
Q

_____ + ______= 14

A

pH, pOH

20
Q

What is the equation for finding pOH given the [OH-] ?

A

pOH= -log [OH-]

21
Q

_______ _______ affect acidic base strength

A

periodic trends

22
Q

_________: a molecule where OH is bonded to another atom (Y)

A

Oxyacids

23
Q

The more electronegative of an atom in an oxyacid, the more ______ the acid

A

acidic

24
Q

T or F: position of equilibrium favors transfer of proton to stronger base

A

True

25
Q

When one of the reactants is a strong acid/ base, and the other is a weak acid/ base, we can also assume the reaction _______

A

goes to completion

26
Q

weak acids are _______ acids

A

monoprotic acids

27
Q

_______ contain more than one acidic protons

A

polyprotic

28
Q

Which is generally higher
Ka1 or Ka2?

A

Ka1

29
Q

T or F: the second dissociation is always weaker than first

A

True

30
Q
A

Chem 105 (24 decks)

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