THE DETERMINATION OF NaCl IN TABLE SALT

THE DETERMINATION OF NaCl IN TABLE SALTBy:ReynaldiNurul HusnaNurul AuliaResky AuliaRifandi. R3AIntroductionTitrimetric analysis is a part of chemical analysis based on the measurement of the volume of a solution of known concentration required to react with the desired constituent.The chemical reactions that may serve as the basis for titrimetric determinations are conviniently grouped into 4 types, as follows:Neutralization titrationReductometry and OxidimetryPrecipitimetryComplexometry

IntroductionPrecipitimetry is a part of titrimetric analysis based on precipitation of chloride, iodide, bromide, and thiocyanate with the standard solution of silver nitrate (AgNO3)Argentometric is divided into 3 method as follows:Mohr methodVolhard methodFayans method

Basic PrincipleNeutral chloride ion is titrated by silver nitrate and yields silver chloride precipitate. Potassium chromate is added as the indicator in this titration. It will form a red precipitate of silver chromate. All of the chloride ion will be precipitated before the chromate ion. Because it's solubility product is lower than chromate ion's

ReactionAgNO3 + NaCl AgCl + NaNO32AgNO3 + K2CrO4 Ag2CrO4 + 2KNO3

Chemicals and EquipmentsTable saltAgNO3 0.0506 NK2CrO4 5%Analytical balanceErlenmeyer flaskVolumetric flaskVolumetric pipette Burette Beaker glass

ProceduresWeigh 0.8 g of table salt and dissolve it in the volumetric flask 100 ml, dilute it and then homogenize it.Dispense 10 ml of the sample solution into the erlenmeyer flask using the volumetric pipette, and add 2 ml of K2CrO4 5%.Titrate the solution with AgNO3 0.05N until it forms a red precipitate

Observation DataSample weight= 800.3 mgVolume of titrant= 26.33 mlThe colour of solution before adding the indicator= noneThe colour of solution after adding the indicator= yellowThe colour of precipitate at the end point= brownish red

Calculation

Conclusion and SuggesttionFrom the calculation result, we can conclude that the percentage of sodium chloride (NaCl) in table salt is 97.39 %.This kind of analysis method can be used for determining other constituent such as, chloride, bromide, iodide or thiocyanate. And for the table salt itself, can be determined using spectrophotometery or gravimetric method.

Bibiliography

academic.brooklyn.cuny.eduhttp://en.wikipedia.org/wiki/Saltwww.outreach.cantebury.ac.nz/chemistry/documents/chloride_mohr.pdfRatta, Darius, 2012, Bahasa Inggris 2, Kementrian Perindustrian republik Indonesia, Makassar

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