Procedure: Part A – Standardization of a Sodium Hydroxide Solution 1. Prepare 150 mL of approximately 0.5M sodium hydroxide solution from solid NaOH. The solution can be prepared in a beaker‚ it is not necessary to use a graduated cylinder or a volumetric flask because the NaOH solution will be standardized. 2. Weigh a 150-mL beaker and record the mass to the nearest 0.001 g. Add approximately 0.5 grams of potassium hydrogen phthalate
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Materials i. Beaker ii. Burette iii. Glass rod iv. Volumetric flask 50 ml v. Dropper vi. Retort stand vii. Distilled water viii. Orange soda pop (F&N) Method Sample preparation 1. The soda pop was poured into a beaker and stirred to remove the carbonate substance. 2. The soda pop was pipette into a burette. 3. 5 ml of soda pop was dropped into a volumetric flask and was diluted with distilled water. 4. Step 3 was repeated for
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Method To set up the standards for a calibration curve we would make solutions of different concentrations of ethanol. Using a 25cm3 volumetric flask we would put 10cm3 of 25% Propanol into each one which would act as an internal standard. We would then add differing amounts of ethanol (0.5 cm3‚ 1.0cm3‚ 2.0cm3and 4.0cm3) and then top the volumetric flask up with distilled water. These would act as our standards to create a calibration curve. These standards are shown below in Table 1.0
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emptied and weight of granules was calculated by subtracting weight of each empty shell from each capsule weight. Average weight was determined and an accurately weighed quantity of granules equivalent to 10 mg of DAB was transferred into 10 ml volumetric flask and dissolved in 5 ml of DMSO and sonicated for 10 minutes. Then the volume is made up to mark with the DMSO and filtered through whatmen filter paper. Further the filtrate was diluted with DMSO to get final concentrations within linearity
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(effervescent type) in a 50 ml beaker. Add about 30 ml of deionised water to dissolve the vitamin C tablet. Once the tablet has dissolved completely‚ transfer the solution into a 250 ml volumetric flask via a plastic filter funnel. Rinse the beaker twice with some deionised water and transfer the washings into the volumetric flask. Rinse the filter funnel as well. At this point‚ more water is added carefully until the bottom of the meniscus is right on the line. Stopper the flask and complete the mixing
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Redox Titration Analysis of a Commercial Bleach Purpose To perform a redox titration. To determine the amount of hypochlorite ion present in commercial bleach. Introduction Many commercial products‚ such as bleaches and hair coloring agents‚ contain oxidizing agents. The most common oxidizing agent in bleaches is sodium hypochlorite‚ NaClO (sometimes written NaOCl). Commercial bleaches are made by bubbling chlorine gas into a sodium hydroxide solution. Some of the chlorine is oxidized
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Lab 9: Analysis of Commercial Bleach Introduction Many common products are effective because they contain oxidizing agents. Some products‚ which contain oxidizing agents‚ are bleaches‚ hair coloring agents‚ scouring powders‚ and toilet bowl cleaners. The most common oxidizing agent in bleaches is sodium hypochlorite‚ NaClO (or NaOCl). Commercial bleaches are made by bubbling chlorine gas into a sodium hydroxide solution. Some of the chlorine is oxidized from the molecular form (Cl2) to the
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In titration‚ standard solutions are now usually expressed in terms of molarity‚ M : In many cases it is possible to prepare a standard solution by accurate weighing of the solute‚ followed by precise dilution to an exactly known volume in a volumetric flask. One of the most common standard solutions used in acid-base titration analysis‚ however‚ cannot be prepared in this manner. Solutions of sodium hydroxide are commonly used in titration analysis of samples containing an acidic solute. Although
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Unit 1: Unit code: QCF Level 3: Credit value: Fundamentals of Science R/502/5536 BTEC National 10 Guided learning hours: 60 Aim and purpose The aim of this unit is to enable learners to develop the practical techniques necessary to pursue a career as a laboratory technician. Learners will investigate the quantities necessary in chemical reactions‚ the structure and functions of cells‚ the calorific value of different fuels and develop skills in communicating scientific information. Unit
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must be kept constant. Apparatus/ Materials Pipette (25.00±0.03 cm3)‚ pipette (10.00±0.02 cm3)‚ pipette (5.00±0.001 cm3)‚ burette (50.00±0.05 cm3)‚ micropipette (1.00±0.003 cm3)‚ digital stop watch (±0.01s ???)‚ test tubes‚ beakers‚ test tube rack‚ volumetric flask‚ ‚ retort stand with clamp‚ distilled water‚ pipette filler‚ spatula‚ dropper‚ water bath‚ thermometer ‚ standard potassium iodide KI 1.0 mol dm-3 solution‚ sodium thiosulphate Na2S2O3 0.05 mol dm-3 solution‚ sodium peroxodisulphate Na2S2O8
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