The Study of Titration (Volumetric Analysis)

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-Name of the experiment: The study of titration (volumetric analysis) -Purpose: To investigate the titration two standard solutions with opposite pH values and the relationship between pH value and volumes of the reactants. Use this method to determine active ingredients in a commercial basic product. -Task Procedure: Section 1: The making of a standard solution of sodium hydroxide. Section 2: The use of a pH probe and computer program to produce a simple titration curve. Section 3: The titration of an unknown concentration of HCl with the standard solution of NaOH. Section 4: Use the HCl solution titrate a commercial basic product and determine the quantity of active ingredient. -Section1: Preparation of a Standard Sodium Hydroxide Solution Materials 250-mL volumetric flask Weigh scale Weighing bottle, or watch glass for NaOH sample, Glass funnel Dropper pipette 100 ml beaker Deionized water NaOH solid Procedure 1. Weigh approximately 1 gram of NaOH in a weighing bottle. Record the actual mass (1.01 grams weighed) in the results table. 2. Transfer the sample of NaOH to the 250 ml volumetric flask. 3. Put approximately 50 ml of deionized water into the flask and dissolve all of the NaOH. 4. Make the flask up to the graduation mark with deionized water, taking care to use drop by drop when the volume is close to the graduation mark. 5. Check with your teacher that the bottom of the meniscus is on the graduation mark. 6. Put the stopper in the volumetric flask and shake to ensure a uniform solution for around 15 mins. 7. Label the flask with yours and your partner’s name. Results: +Calculate the molarity of your sodium hydroxide solution. Number of mole of sodium hydroxide = 1.02grams/40 relative mass = 0.02556 mole Molarity of the sodium hydroxide solution = 0.02556mole/0.25 litre = 0.102 M

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