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Aim: To determine the relative composition of a mixture solution containing sodium ethane-1, 2-dioate and ethane-1, 2-dioic acid.

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DETERMINATION OF THE RELATIVE COMPOSITION OF A MIXTURE SOLUTION AIM To determine the relative composition of a mixture solution containing sodium ethane-1, 2-dioate and ethane-1, 2-dioic acid. INTRODUCTION Potassium permanganate KMn is a strong oxidizing agent which reacts with reducing agent ethanedioate ion to give and C + 2 Mn+ 16 2+8+10 Sodium hydroxide (NaOH) reacts with acid to give water . the reaction is shown with the following equation + To investigate the relative composition of the mixture solution, it has to be titrated with NaOH first with phenolphthalein as indicator and then with acidify KMn as Mn react with both compound. KMnhas to be acidified first, otherwise brown ppt of Mn is formed instead of 2 H2O + MnO4- + 3 e- � Mn+ 4 In addition to that, the reaction solution has to be warmed to about 70 as the reaction rate is very slow. ...read more.


7. The heated mixture is then titrated with 0.02M Potassium permanganate KMn until a permanent pink colour is observed 8. Record the result in Table2 RESULT Table 1 Titration result of mixture solution against NaOH Trial 1 2 3 Final burette reading 15.4 27.3 39.0 12.8 Initial burette Reading 3.1 15.4 27.3 1.0 Volume of NaOH Added 12.3 11.9 11.7 11.8 Mean Volume of NaOH added ( 11.7+11.8+11.9) /3 =11.8 Table 2 Titration result of mixture solution against KMn Trial 1 2 3 Final burette reading 35.0 26.4 45.5 40.6 Initial burette Reading 16.3 7.1 26.4 21.4 Volume of NaOH Added 18.7 19.3 19.1 19.2 Mean Volume of NaOH added ( 19.3+19.1+19.2) /3 =19.2 CALCUALTION Equation involved in the reaction between NaOH and mixture solution: + +Na(aq) ...read more.


4Mn 4Mn +3 In addition, if hot Potassium permanganate solution is added to the burette, it may cause expansion of burette, causing inaccurate measurement. END POINT The end-point is not very permanent because if the Mn ion is in large excess, the following reaction occur: 2 Mn+3+ 2 +4 DECOPOSITION OF POTASSIUM PERMANGANATE Potassium permanganate is easily decomposed and the decomposition is speed up by light, heat, acids, base, reducing agent in air such as hydrogen sulphide gas, , , and even by the end-product Therefore, it should be stored in brown bottle and should be standardized before use. ABSORPTION OF WATER BY SODIUM HYDROXIDE sodium hydroxide absorb water from air. The volume of solution increase, and hence cause a decrease in concentration, causing inaccurate calculation CONCLUSION The concentration of sodium ethane-1,2-dioate is 1.48xM while ethane-1, 2-dioic acid's is 2.36 x M REFERFERNCE Wikipedia ?? ?? ?? ?? Chan ting hin 6b 11 ? 1 ...read more.

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