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Acud And Bases Flashcards

(11 cards)

1
Q

Brønsted Lowry
What is an acid ?

A

Proton donor

Nh3 +H~>Nh4

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2
Q

What is a base¿

A

Proton acceptor
Water can be and acid or a base

HCl + H2O~>H3O* + Cl

Water accepted a proton

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3
Q

How do you calculate ph and definition

A

pH=-log([H*]

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4
Q

Equation for [H*]

A

[H*]= 10’pH

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5
Q

kW

A

Kw =ionic product
Cancels the constant
Equilibrium lies really far to left
1x10^’14 mol dm’2 dm’6

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6
Q

What standard condition does kw need to be under

A

298k at equilibrium

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7
Q

Equation for kw

A

Kw=[H]* x [OH~]

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8
Q

What if I wanted to fine [H]* and we given the kw

A

Square root the value of kw

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9
Q

Bufffers

A

Solution used to keep ph constant
Withstand small addition of [H]* and [OH]~

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10
Q

For acidic buffers

Mixture of weak acid + salt
Ethanoic acid + sodium ethanoate

CH3COOH _~ CH3COO + H*

CH3COONA ~> CH2COO~ + Na*
Equilibrium to left

A

Add acid [H]* react with the salt CH3COO’~> CH3COOH remains the ph constant

Add alkali. [OH ]’ react with H*
Equilibrium shifts to right to replace h* loss remains the ph constant

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11
Q

For basic buffers
Weak acid + salt

Ammonia + ammonium chloride

NH3 + H2O ~> NH4* + OH’
NH4Cl ~> NH4* +Cl’

A

Add acid [H]* react with OH’
Equilibrium shifts to right to replace oh’

Add alkali. [OH’] react with salt
Ammonium
ph constant

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