Buffers And Neutralisation Flashcards by Reece Webb | Brainscape

Q

What is a buffer

A

Minimises change in Ph when acid or base is added

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Q

How to prepare a buffer

A

Weak acid and its salt

Partial neutralisation of a weak acid

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Q

What happens when H+ is added

A

H+ reacts with A- to form HA

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Q

What happens when OH- is added

A

Shifts to right H+ plus OH- -> H2O

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Q

What is the equation for a buffer

A

KA= (H+) (A-) / (HA)

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Q

What Ph does blood need to be?

A

7.4

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Q

What is the buffer for blood

A

Hco3

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Q

What happens when Oh increases in blood

A

Reacts to form H2O

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Q

What is the equivalence point

A

When the solutions have exactly reacted with each other (middle of vertical section)

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Q

What indicator should be used 2,4

A

Methyl orange

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Q

What indicator should be used 6-8

A

Bromomythnolblue

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Q

What indicator should be used 8-10

A

Phenyl plhaline

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Q

How to choose an indicator

A

Ph must be similar to vertical section

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Q

On Ph graph what is the Y and X axis

A

Y axis = Ph

X axis = Volume of base

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Q

How low should a strong acid be

A

Low

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Q

How high should a strong base be

A

High