Determination Of The Relative Composition Of a Mixture Solution Essay Example for Free

Determination Of The Relative Composition Of a Mixture Solution EssayTo determine the sexual intercourse composition of a florilegium root word containing sodium ethane-1, 2-dioate and ethane-1, 2-dioic acid.INTRODUCTIONPotassium permanganate KMn is a strong oxidizing agent which reacts with reducing agent ethanedioate ion to give and C+ 2 Mn+ 16 2+8+10Sodium hydroxide (NaOH) reacts with acid to give water . the reaction is shown with the following equation+To investigate the intercourse 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 cook ppt of Mn is formed instead of2 H2O + MnO4- + 3 e- Mn+ 4In addition to that, the reaction solution has to be warmed to active 70 as the reaction rate is very slow.MATERIALS AND APPARATUSbeakermeasuring cylinder.Safety spectaclesbeaker cone-shaped flaskpipette ,25burette ,50, and st and slipstream bottlewhite fileelectrical heatersulphuric acidPotassium permanganate KMn solutionMixture solutionPROCEDURE1. 25.00of the mixture solution was transferred into a 250conical flask using a pipette rinsed by distilled water and the mixture solution2. The burette rinsed by distilled water and NaOH is filled with NaOH3. Titrate the mixture solution with 0.1M NaOH solotuion using phenolphthalein as indicactor4. Until the solution turns pink, result is recorded in table 15. About 25.00of 1M sulphuric acid (using measuring cylinder) is added to the conical flask .6. The mixture is then heated by electrical heater to at least 70.7. The heated mixture is then titrated with 0.02M Potassium permanganate KMn until a permanent pink contort is observed8. Record the result in Table2RESULTTable 1Titration result of mixture solution against NaOH mental test123 nett burette reading15.427.339.012.8Initial burette Reading3.115.427.31.0Volume of NaOH Added12.311.911.711.8Mean Volume of Na OH added( 11.7+11.8+11.9) /3 =11.8Table 2Titration result of mixture solution against KMnTrial123Final burette reading35.026.445.540.6Initial burette Reading16.37.126.421.4Volume of NaOH Added18.719.319.119.2Mean Volume of NaOH added( 19.3+19.1+19.2) /3 =19.2CALCUALTIONEquation problematic in the reaction between NaOH and mixture solution+ +Na(aq)Mole ratio of NaOH=21==11.8/10000.1/2=5.9xmolMolarity of = 5.9X/(25/1000)=2.36 x M+ 2 Mn+ 16 2+8+10Mole ratio of Mn=52==519.2/10000.02/2=9.610-4 molMole of sodium ethane-1,2-dioate = 9.6x-5.91 l= 3.7 x molMolarity of sodium ethane-1,2-dioate in mixture = 3.7 x/(25/1000)=1.48xMDISCUSSIONSCHOICE OF INDICATORSPhenolphthalein is used as indicator in the reaction between Sodium hydroxide and ethane-1, 2-dioic acid be get down the reaction involves a weak acid titrated against a strong alkali.REASON FOR HEATING THE MIXTURE SOLUTIONThe rate reaction between and Mn is very slow as there is repulsion between anion.REASON FOR HEATING MIXTURE SOLUTI ON IN THE CONICAL FLASK INSTEAD OF MN IN THE BURETTEAqueous solution of Potassium permanganate KMn is unstable and can easily be decomposed. The decomposition is accelerated by heat. If it is put in the conical flask and heated, it will easily oxidize water to oxygen and the amount ofKMn is therefore decreased.4Mn 4Mn +3In addition, if hot Potassium permanganate solution is added to the burette, it may cause expansion of burette, cause inaccurate measurement.END POINTThe end-point is not very permanent because if the Mn ion is in large excess, the following reaction occur2 Mn+3+ 2 +4DECOPOSITION OF POTASSIUM PERMANGANATEPotassium permanganate is easily decomposed and the decomposition is speed up by light, heat, acids, base, reducing agent in communicate 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 piddle BY SODIUM HYDROXIDEsodium hydroxide absorb water from air. T he volume of solution increase, and hence cause a decrease in concentration, causing inaccurate calculationCONCLUSIONThe concentration of sodium ethane-1,2-dioate is 1.48xM while ethane-1, 2-dioic acids is 2.36 x M