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