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Unformatted text preview: ionable point should be retained. Spring 2007 Example
Measurement # 1 2
4.128 3 4.011 4 4.009 5 4.015 Mass of a sample (g) 4.012
gap range Q calculated = gap = | xsuspect xnear | range = xmax xmin xsuspect = 4.128 xmin = 4.009 xmax = 4.128 xnear = 4.015 gap = | 4.128 4.015 | = 0.113 range = 4.128 4.009 = 0.119
0.113 = 0.95 0.119 Qtable = 0.64 Q calculated = Qcalculated = 0.95 > Qtable = 0.64 xsuspect = 4.128 can be rejected Spring 2007 Equipment and Techniques: Heating and Mixing
Hotplate/Stirrer Magnetic Stirring Bar Retriever Magnetic Stirring Bar Center the beaker on top of the hot/stir plate and start the magnetic stirrer on a low rotational speed Move the beaker around until you stabilize the stirring bar inside the solution and it starts spinning quietly in the middle of the beaker
Stirring speed regulating knob Heat regulating knob Increase the rotational speed, so that a small swirl is formed inside the beaker Spring 2007 Equipment and Techniques: Gravity Filtration Vacuum...
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- Spring '08