OBSERVATION: Thre is water droplets around the test tube. It is colourless and odourless. It turns white anhydrous copper II tetraoxosulphate VI blue. It is neutral to litmus
INFERENCE: Fe²+, Cu²+ are suspected
INFERENCE: SO4²-, CO3²-, and SO3²- are present
INFERENCE: SO4²- present
INFERENCE: Dehydration of organic salt occurs
INFERENCE: Reducing sugar ie glucose is present
INFERENCE: Reducing sugar ie glucose is confirmed
-Filtration removes Pb(SO4)2
-Sublimation removes NH4Cl
-Filtration and evaporation is used to recover NaCl
V1 = 50.0cm³
C1 = 0.05moldm
C2 = 0.01
C1V1 = C2V2
Using dilution formula
0.05×50 = 0.01×V2
V2 = 0.05×50/0.01 = 250cm³
Hence volume of water that should be added
V = V2 – V1 = 250 – 50 = 200cm³
Shine a beam of light to each of solutions of glucose and starch. Starch will disperse the ray of light (Tyndall effect) while glucose will not.
I – Physical test: Shine a beam of light to each of solutions of glucose and starch. Starch will disperse the ray of light (Tyndall effect) while glucose will not.
II – Chemical Test: Use Benedict’s solution on starch; No positive result WHILE on glucose, It shows a positive test of brick red or orange colour.