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Naoh Standardisation Titration Volume 26 3ml Concentration Of Hcl 0 1080m

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2. Experimental Procedure
In this experiment you will determine the heat of solution of benzoic acid in water. Ill. Saturate about 600 ml of distilled water with benzoic acid (6 g is sufficient), by stirring
for about ten minutes with water heated to 60 °C. Divide the hot solution between
five 250-mL conical flasks and stopper each with a rubber bung. Place one each of the
conical flasks in constant temperature water baths at 10, 25, 35, 45 and 55 °C. The
flasks will require about half an hour to attain thermal equilibrium; they should be
shaken occasionally during this period. While the flasks are thermally equilibrating, standardise (this means use titrations to
determine the exact concentration of) the 0.1 M NaOH solution provided, using pre-
standardised HCI solution (0.1xxx M) Titrate the NaOH from a burette into 25.00 mL
(pipetted!) aliquots of the HCI. This must be done accurately! Use the standardised
0.1xxx M NaOH solution to prepare 0.04xxx M NaOH (accurately dilute say 200 mL
(burette) to 500 mL (volumetric f|ask)). After about half an hour, prepare to take two 25-mL samples from the conical flask in
the 10 °C bath. These samples of solution must be collected without drawing up any
crystalline material from the saturated solution into the pipette. This task can be
made much easier by first filtering the solution through a large filter paper (or lab
paper) in a filter funnel into another (dry!) flask, so as to remove all of the solid. %
a few cgstals of the solid and return them to the solution so as to keep it saturatedI
and return this flask to the bath for five minutes to re-equilibrate before withdrawing
the two 25-mL samples. MEASURE AND RECORD THE EXACT TEMPERATURE OF THE
SOLUTION IN THE FLASK IN THE BATH AT THE TIME THE SAMPLES ARE WITHDRAWN.
Titrate these samples with 0.04m M NaOH using phenolphthalein as the indicator. If Science