Volumetric Pipette Lab

1320 Words 5 Pages
Aim
The aim of this practical is to measure the effect of volume, density and temperature. It is also help to be familiar with variety of common laboratory technique.
Materials
Weighting scale
Container with lids
20 and 10 ml Volumetric pipette
Beaker
Thermometer
Test Tubes
Volumetric flask
Natural Rubber Pipette Filler
Micropipette tips
Tips boxes
Method
There are two pipette, choose one which you using in whole practical. Label and weight accurately, to 4 decimal places. Collect three container and weights with significantly and place water on tube and measure the temperature. Using the volumetric pipette and transfer 20.0mL of de-ionised water into each weighting tube and put the lids on the correct tube. Reweight the tube
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Now move onto using 10mL volumetric pipette. Measure the temperature of the water again as before. In exact same way as before now pipette 10mL of water into 3 dry tubes and re-weight. Calculate the volume of water in each tube using 10mL volumetric pipette. Refer to practical – Chemistry Experiment 1 procedure by UniSA/Anthea Fudge, 2015, pages 149-158.

Observations
In this practical there are some thing happen which is after measuring the two sample my weight scale was not working. When using the Natural Rubber Pipette Filler, the first time my pipette filler was licking the air that’s the reason need to change to pipette filler. The bubble was found when using measuring water from volumetric pipette.
Results
(Using 20ml volumetric pipette)
Tube Initial weight (empty) (g) weight of Weight (g)
1 12.2052 32.1879 19.9827
2 12.2548 32.2517 19.9969
3 12.0436 31.9941
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For, example, final volume of the mean volume of 10ml of water is calculated to 10. ; Analysing the density vs temperature graph as temperature increase the density will decrease. In graph above show that when temperature is 160C our density is 0.998 in other hand temperature is 19.00C and density is 0.9972.Random errors in this particle are measuring the water on volumetric pipette. Random errors are minimized by taking more data and it can be reduced by averaging the data which we collect by add them all and divided by the total number (to overcome the random error we take average). Systemic errors is an error that is constant or drifting slightly and is due to a consistent mistake made during the analysis. A systematic in this practical includes, differing or incorrect analytical method to that used to determine he true value.in this practical is constant weighting this water and empty container. To minimised systematic errors we need to take care more when we conducting practical. There are some little errors but overall practical was successful

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