Question

Devise an experiment to study the dependence of rate of precipitation of sulphur upon the
nature of monobasic acid for the reaction given below :
S2O3
2– (aq) + 2H+
(aq) → H2O (l) + SO2
(g) + S(s)

Answer 1

The aim of this experiment is to study the effect of the temperature and concentration variation on the reaction rate between the hydrochloric acid and sodium thiosulphate.  

Explanation:

Sulphur has the property of the colloidal solution resulting in making the translucent system. This is used for studying the sulphur’s precipitation rate.

The concentration effect on the reaction rate:

• Fill the trough with half of water. Burette should be filled with 1.0 M HCl solution. In the centre of the outer surface, make a mark X in a 100 mL beaker.
• In it, fill 50mL of 0.1M sodium thiosulphate. Leave the beaker to stand for few minutes. This will help in attaining the bath's temperature.  
• Then, add 1.0 mL of 1.0 M HCl solution using burette. Record the time for marking 'X' at the beaker's bottom. The experiment can be repeated by adding 16 mL, 8 mL, 4 mL, and 2 mL of 1.0 M HCl solution to sodium thiosulphate solution.  
• The time required for disappearance of mark is recorded.

The temperature effect on the reaction rate:

• In a 100 mL beaker, take 50 mL of 0.1M sodium thiosulphate solution. In the centre of the outer surface make a mark X in a 100 mL beaker.
• A thermostat should be maintained in a beaker at 30°C. Add 5 mL of 1.0 M hydrochloric acid. After the addition of half of the amount, start the stopwatch.  
• Record the timing and repeat the experiment using fresh sodium thiosulphate solution at 50°C, 60°C, 40°C and 70°C. record the disappearance time using the mark ‘X’.
• Record the observation and plot the graphs. This helps to determine the HCl concentration and the time taken for the mark to become unseen.

To learn more:

1. The rate of formation of SO3 in the reaction 2SO2+O2-->2SO3 is 100g/min.rate of disappearance of O2.

brainly.in/question/1297322

2. Which of the following has maximum number of molecules 1)2.7g of NH3 2)1ட so2 3)2ட of cl2 at stp 4)0.1 mol of H2S.

brainly.in/question/6575674

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