THE DETERMINATION OFNaCl IN TABLE SALT By: Reynaldi Nurul Husna Nurul Aulia Resky Aulia Rifandi. R 3A The chemical reactions that may serve as the basis for titrimetric determinations are conviniently grouped into 4 types.Introduction Titrimetric 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. as follows: • Neutralization titration • Reductometry and Oxidimetry • Precipitimetry • Complexometry . iodide.Introduction Precipitimetry is a part of titrimetric analysis based on precipitation of chloride. bromide. and thiocyanate with the standard solution of silver nitrate (AgNO 3) Argentometric is divided into 3 method as follows: • Mohr method • Volhard method • Fayans method . Basic Principle Neutral chloride ion is titrated by silver nitrate and yields silver chloride precipitate. All of the chloride ion will be precipitated before the chromate ion. Because it's solubility product is lower than chromate ion's . Potassium chromate is added as the indicator in this titration. It will form a red precipitate of silver chromate. Reaction • AgNO3 + NaCl AgCl + NaNO3 • 2AgNO3 + K2CrO4 Ag2CrO4 2KNO3 + . 0506 N K2CrO4 5% Analytical balance Erlenmeyer flask Volumetric flask Volumetric pipette Burette Beaker glass .Chemicals and Equipments • • • • • • • • • Table salt AgNO3 0. and add 2 ml of K2CrO4 5%. • Dispense 10 ml of the sample solution into the erlenmeyer flask using the volumetric pipette.Procedures • Weigh ± 0.05N until it forms a red precipitate . dilute it and then homogenize it. • Titrate the solution with AgNO3 0.8 g of table salt and dissolve it in the volumetric flask 100 ml. 33 ml • The colour of solution before adding the indicator = none • The colour of solution after adding the indicator = yellow • The colour of precipitate at the end point = brownish red .Observation Data • Sample weight = 800.3 mg • Volume of titrant = 26. Calculation . chloride.Conclusion and Suggesttion • From the calculation result.39 %. • This kind of analysis method can be used for determining other constituent such as. we can conclude that the percentage of sodium chloride (NaCl) in table salt is 97. . can be determined using spectrophotometery or gravimetric method. And for the table salt itself. bromide. iodide or thiocyanate. brooklyn.wikipedia. Makassar .cuny. Bahasa Inggris 2. Darius.outreach.org/wiki/Salt • www.nz/chemi stry/documents/chloride_mohr.pdf • Ratta.ac.cantebury. Kementrian Perindustrian republik Indonesia. 2012.Bibiliography • academic.edu • http://en. THANK YOU FOR YOUR ATTENTION . .• First of all I’d like to thank to God for his blessing so we can gather here • And also my thanks to our very very very handsome teacher and the audiences for giving us the chance to present our discussion result • So lets begin.