1b- Liquids and Solutions Flashcards

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1
Q

What is characteristic of a linear dilution series?

A

Dilutions differ by an equal interval, e.g. 0.1, 0.2, 0.3 etc

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2
Q

What is characteristic of a log dilution series?

A

Dilutions differ by a constant proportion, e.g. 0.1, 0.01, 0.001 etc

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3
Q

How can unknown concentrations be found?

A

Plotting measured values for known concentrations to produce a line or curve allows the concentration of an unknown to be determined from the standard curve

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4
Q

What is a buffer used for?

A

To maintain a constant pH of a reaction mixture (addition of acid or alkali will have very small effects on the pH of a buffer)

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5
Q

What must a calorimeter be calibrated with?

A

A blank so as to obtain a baseline

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6
Q

How can the concentration of a coloured substance be determined?

A

By obtaining an absorbance reading on a colorimeter using suitable wavelength filters

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7
Q

Percentage transmission of a sample can be used to determine what and when could this be used?

A

Turbidity of a sample and this method could be used when calculating the cells in a suspension

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