Chemistry/Identifying and Making Mixtures Prep

Preparation for Science 8 Lab IDENTIFYING MIXTURES VERSUS PURE SUBSTANCES AND MAKING MIXTURES 

12 Sets of 11 different small test tubes:


 * Tube A:	2 mL of saturated copper sulphate solution
 * Tube B: 	2 mL of saturated sodium chloride solution
 * Tube C: 	2 mL of ethanol
 * Tube D:	1 mL of a 1:3 mixture of white sand and sodium chloride, thoroughly mixed together.
 * Tube E:	1 mL of powdered cupric sulphate
 * Tube F:	2 mL of salad oil
 * Tube G:	2 mL of vinegar containing a small amount of green food colouring (not too dark)
 * Tube H:	1 mL of glycerine
 * Tube I:	0.2 – 0.3 g of starch
 * Tube J:	5 mL of 0.2 M sodium thiosulphate, Na2S2O3•5H2O
 * Tube K:	10 drops of 2 M hydrochloric acid

Equipment needed:


 * 4 dozen watch glasses
 * dropping pipets
 * 2 – stands with rings and clay triangles
 * 2 – filter funnels with folded filter papers
 * salt water, any concentration – about 100 mL
 * sand in water – about 100 mL