By John R. Dean, Alan M. Jones, David Holmes, Rob Reed, Jonathan Weyers, Allan Jones
This text's detailed and accomplished insurance comprises: basic recommendation on useful paintings; simple laboratory talents, classical and instrumental options; research and presentation of knowledge; info expertise; library assets; and speaking details.
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Extra resources for Practical Skills in Chemistry
1. 6. Add the chemicaf to a beaker or conical flask and then add a little less water than the finat v<»ume required. If some of tho chemical sticks to the weighing receptacle, use some of the water to wash it off. For accurate solutions. see p.. 19 for accurate weighing Hnd quantitative transfer. 7. Stir and. if necessary. heat the solution to ensure 511 the chemical dissolves. You can determine visually when this has happened by observing the diseppaarance of the crystals or powder. Allow the solution to cool, if heated.
5 Gravity filtration. Filtering solids - if you allow the solid to settle you will have difficulty pouring the thick slurI)' of solid and liquid from the bottom of the beaker or conical flask into the filter cone and you will need to use more filtrate to complete the filtration effectively. To filter the mixture; swirl the suspension of the solid in the liquid so that there is a fairly even distribution of solid in the liquid. and then pour the mixture into the filter cone, making sure that you do not pour any of the mixture outside the filter paper otherwise you wiU need to repeat the filtration, and do not overfill the filter cone.
Burette clamps arc specially designed 10 hold the burette vertically. ng and lateral movement. Since the burene damp slides do'Ml the rod of the support stand. then provided lhe support stand is vertical. the burene will be vertical. Support rings T~ metal rings come in various diameters to support filter funnels and separalory funnels. Often these support ring> are coaled in plastic to provide the cushion between metal and g1a~. Basic laboratory procedures II If your support ring is metal. you can make a 'cushion' by finding a piece of thin-walled rubber tubing of the same bore as the metaJ of the ring, cuning it to a length equivalent to the circumference of the ring and then cUlling down the lenglh of the rubber tubing.
Practical Skills in Chemistry by John R. Dean, Alan M. Jones, David Holmes, Rob Reed, Jonathan Weyers, Allan Jones