vitamin c content

IV/ change
Vitamin C drinks, Type of juice drink or age of juice. At least 5 diff
1 of 9
juice
same age of juice unless this is being investigated
2 of 9
Reliability
Repeat 4/5 times, calculate mean, discard anomalies
3 of 9
measurement
Volume of solution needed to decolourise DCPIP
4 of 9
same
Volume of DCPIP, size of drops put into the DCPIP using pipette, same end point colour, shake each tube same number of times, temperature
5 of 9
safety
DCPIP - skin irritation, serious eye irritation, harmful if swallowed
6 of 9
other discussion points
Difficulty in controlling temperature Amount of shaking (too much adds oxygen which will slightly restore the DCPIP to blue) End point difficult to judge as needs to be just when blue colour disappears especially in highly coloured juices
7 of 9
other discussion points
Some loss of solution when transferring from one beaker to another Accuracy of measuring equipment
8 of 9
overall method
using a known concentration and volume of Vitamin C. a calibration curve can be formed by titrating it with a known volume of DCPIP until it decolorises
9 of 9

Other cards in this set

Card 2

Front

juice

Back

same age of juice unless this is being investigated

Card 3

Front

Reliability

Back

Preview of the front of card 3

Card 4

Front

measurement

Back

Preview of the front of card 4

Card 5

Front

same

Back

Preview of the front of card 5
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