Liquids And Solutions Flashcards

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1
Q

What are the two ways to change a substance concentrations

A

Linear dilutions and log dilutions

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2
Q

What’s a linear dilution

A

Dilutions differ by an equal interval e.g 0.1,0.2,0.3 and so on

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3
Q

What’s a log dilution

A

Dilutions differ by a constant proportion e.g10-1(0.1), 10-2(0.01)

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4
Q

What’s a standard curve

A

Plotting known measurements on a graph to then use to determine unknown values

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5
Q

What’s a buffer definition

A

A solution where adding acids or alkalis have very small effects on the PH. This allows ph in a reaction mixture to be kept constant

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6
Q

What are colorimeters used for

A

To quantify concentration and turbidity

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7
Q

How to colorimeters work

A

Light is split into its component colours and filtered so there is one wavelength of light. This is then passed through the sample solution where a detector picks up absorbable or transmitted

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8
Q

What needs to be done before using a colorimeter

A

They need to be calibrated with an appropriate black sample to provide a baseline reading

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9
Q

What’s absorbance used to determine

A

Concentration of a coloured solution using suitable wavelength filters

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10
Q

What’s percentage transmission used to determine

A

Turbidity such as cells in suspension

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