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Practical report 2.pdf - LABORATORY REPORT SKL1013 A212S...

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EXPERIMENTEXPERIMENT 3TITLEGRAVIMETRICANALYSIS:DETERMINATIONOFCHLORIDE ION IN SODIUM CHLORIDE SALTSTUDENT’S NAME1) KHAIRUNNAZIHA BINTI MD TAHIRMATRIC NO.E20211028956LECTURE GROUPGROUP BLECTURER NAMEDR. MOHAMAD IDRIS BIN SAIDINCHECKLISTMarksGrammar10Format and Style10Introduction10Materials10Methods10Results10Discussion10Conclusion10References10Conceptualunderstanding10TOTAL MARKS100LABORATORY REPORTSKL1013 A212S
Title:Gravimetric analysis: Determination of chloride ion in sodium chloride saltObjectives:Upon completion of this experiment, students should be able to:1)To recover the silver chloride.2)To determine the percentage of chloride ion of NaCl salt.Introduction:Quantitative analysis is a method used to determine exact amounts or concentrations of anunknown analyte. An analyte is a substance that is analysed by some scientific procedure.Gravimetric analysis is a method in quantitative analysis where an unknown sample is dissolvedin an appropriate solvent, and the analyte is converted to an insoluble form of a known compound.The precipitate is then collected, dried and weighed. From this weight, the amount or percentageof the analyte in the original sample can be determined.In this experiment, the chloride ion of an unknown soluble chloride salt is to be determined. Theunknown is dissolved in distilled water and dilute silver nitrate solution as precipitating reagent isadded to precipitate out the chloride as silver chloride (AgCl). The mass of Cl- can be determinedfrom the fact that it is precipitated and weighed as insoluble AgCl through following equation:mass of Cl-in AgCl= GFCl -x mass of ppt (AgCl)=(𝐹𝑊𝑐𝑙𝐹𝑊𝐴𝑔𝐶𝑙x (11))x mass of ppt (AgCl)
The percent of chloride in the unknown is calculated as follows:%Cl=?𝑎?? ?? 𝐶? − ???? ??? (𝐴?𝐶?)?𝑎?? ?? ?𝑎???? (𝑁𝑎𝐶?)x 100Where:GF = the ratio of the formula weight of Cl-to the formula weight of AgClppt = precipitateFW = formula weightThe concentrated acid solutions used in sample digestion are corrosive and require caution inhandling, particularly when hot. The fume hood should be used for the sample washing process,which gives off poisonous nitrogen oxides, as well as acidic vapours.

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Term
Winter
Professor
NoProfessor
Tags
Solubility, Sodium chloride, Silver nitrate

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