Page 8 - Chemistry - XII

CONTENTS

1. Surface Chemistry 9–18

Experiment - 1: To prepare Lyophilic sol. 9
Experiment - 2: To prepare Lyophobic sol. 10
Experiment - 3: To prepare Lyophobic sol of arsenous sulphide (As S ). 10
2 3
Experiment - 4: To purify the colloidal solution having electrolyte impurities through dialysis. 11

Experiment - 5: To study the role of emulsifying agents in stabilising the emulsions of different oils. 13
2. Chemical Kinetics 19–29

Experiment - 6: To study the effect of concentration on the rate of reaction between sodium
thiosulphate (Na S O ) and hydrochloric acid (HCl). 19
2 2 3
Experiment - 7: To study the effect of temperature on the rate of reaction between Na S O and HCl.
2 2 3
You are provided with M/20 solutions of the two substances. 21

Experiment - 8: To study the rate of reaction of iodide (I ) ions with hydrogen peroxide (H O )
–
2 2
at room temperature using different concentration of iodide ions. 23
Experiment - 9: To study the reaction rate between potassium iodate (KIO ) and sodium sulphite
3
(Na SO ) using starch solution as indicator. 26
2 3
3. Thermochemistry 30–39
Experiment - 10: To determine enthalpy of solution of solid copper sulphate (CuSO ·5H O) in water
4 2
at room temperature. 31

Experiment - 11: To determine enthalpy of solution of potassium nitrate. 33
Experiment - 12: To determine enthalpy of neutralisation of a strong acid (HCl) with a strong base (NaOH). 34
Experiment - 13: To determine the enthalpy change during hydrogen bond formation between
acetone and chloroform. 36

4. Electrochemistry 40–46
Experiment - 14: To study the variation in cell potential of the cell Zn |Zn||Cu| Cu with the
2+
2+

change in concentration of electrolytes CuSO or ZnSO at room temperature. 40
4
4
5. Chromatography 47–52
Experiment - 15: To separate the coloured components (pigments) present in the given extract of
leaves and flowers by ascending paper chromatography and find their R values. 47
f
Experiment - 16: To separate the constituents of a mixture of inorganic compounds having Pb and Cd ions. 48
2+
2+
6. Titrimetric Analysis (Redox Reactions) 53–63
Experiment - 17: You are provided with standard solution of KMnO (M/100). Using this solution find
4
out the molarity and strength of ferrous ammonium sulphate (Mohr’s salt) solution. 55

Experiment - 18: A solution of ferrous ammonium sulphate containing 17.0 g of salt in one litre is
provided to you. Using this solution, determine the concentration of KMnO in gL in the
–1
4
given solution and calculate its percentage purity if ʻXʼ grams of it have been dissolved per litre. 57