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Titration of an Unknown Potassium Halide Against Silver Nitrate Apparatus * 250cm3 volumetric flask + 0.3cm3 * 25cm3 pipette + 0.06cm3 * Filler * Conical flask * 50cm3 burette + 0.05cm3 * Retort stand and burette holder Chemicals * 1.035g + 0.001g unknown potassium halide * Distilled water * 0.1moldm-3 Potassium chromate indicator * 0.05moldm-3 Silver Nitrate Solution Data Collection Mass of solid white Unknown potassium Halide used: 1.035g +0.001g. This was made up to a 250cm3 colourless solution. 0.1moldm-3 yellow potassium chromate indicator was used in this titration. The end point was judged to be when a dark pink precipitate started to form. Rough Titration Titration 1 Titration 2 Titration 3 Initial Burette Reading + 0.05cm3 0.00cm3 18.80cm3 1.00cm3 18.40cm3 Final Burette Reading + 0.05cm3 18.80cm3 36.30cm3 18.40cm3 35.60cm3 Titre +0.1cm3 18.80cm3 17.50cm3 17.40cm3 17.20cm3 The average Titre = 17.50 + 17.40 + 17.20 = 17.36666...cm3 3 = 17.40 (4sf) Data Processing Equation for titration: AgNO3 + KX --> AgX + KNO3 0.050moldm-3 AgNO3 Solution in the burette Average Burette reading = 17.40cm3 + 0.01cm3 25.00cm3 + 0.06 cm3 of the unknown potassium halide solution...

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