Research Question: What are the percent concentrations of Fe3+ ions by mass in fresh parsley and spinach leaves? Scientific Concept Colorimeter measures the absorbance of light by the chemical substances at a certain wavelength. By measuring the absorbance‚ the concentration of a chemical substance can be determined. For the calibration of the colorimeter‚ different concentrations of a standard solution and a control (distilled water) are prepared in cuvettes. These cuvettes are put into the colorimeter
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The volume was made to 10 mL with methanol. One mL of the above solution was diluted to 100 times in a 100 mL volumetric flask with methanol to produce stock solution of 10 g/mL. From this solution 1‚ 2‚ 3‚ 4‚ 5‚ 6‚ 7‚ 8‚ 9 and 10 mL were withdrawn separately in different 10 mL volumetric flasks and volume was made up in each case up to 10mL with methanol to produce the concentrations 1‚ 2‚ 3‚ 4‚ 5‚ 6‚ 7‚ 8‚ 9 and 10 g/mL. Absorbances of these solutions
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Burette x 1 Pipette x 1 Pipette bulb x 1 Volumetric pipette x 1 Phenolphalein Procedure: Step 1- Gather materials‚ put on eyeglasses and apron. Step 2- Pour 50 mL of acetic acid into one 250 beaker and 100 mL of sodium hydroxide into another 250 mL beaker. Step 3- Clean burette‚ volumetric pipette and pipette bulb with distilled water. Step 4- Use a funnel or just the beaker to pour the sodium hydroxide (not above head) into the volumetric pipette. Use the pipette and the pipette bulb
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of distilled water in a beaker. 3. After washing the 250ml volumetric flask with distilled water‚ rinse with more distilled water. 4. Transfer the solution from the beaker to a volumetric flask using a funnel. 5. Wash all traces of the solution from the beaker and funnel by rinsing the beaker and funnel thoroughly with distilled water from a wash bottle into the volumetric flask. 6. Swirl the solution in the volumetric flask but do not invert. 7. Add more distilled water until
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flushed through. Then we recorded the initial buret level to the nearest 0.05 mL. As we used a clean 25-mL volumetric pipet to deliver 25.00 mL of bleach solution into a clean 250-mL volumetric flask we also added distilled water to the mark of the volumetric flask.
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chromate indicator * Tap water * Bottled water * Distilled water Apparatus: * Laboratory oven * Dessicator * Conical flask * Watch glass * Spatula * Glass rod * Burette * Funnel * Volumetric flask * Volumetric pipette Setup: (see diagram under Discussion) Procedure: 1). Weigh accurately approximately 4.5g of pure silver nitrate in powder form. 2). Place the watch glass with the powder in the drying laboratory oven for 30 minutes at
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used in the experiment was (2) 100mL volumetric flask‚ and a (1) 250 mL beaker. At the start of the experiment‚ we prepared standards of benzoic acid solutions that contained 2‚4‚6‚8‚ and 10 mg/L in 0.10M HCl‚ our group prepared the 6 and 6 mg/L standards for all the groups within the laboratory. In one of the 100mL volumetric flask it contained 6 mg/L benzoic acid + 10 mL HCl‚ then diluted to the mark on the flask with DI Water. In the other 100mL volumetric flask it contained 8 mg/L benzoic acid
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choice of equipment and how it affected the accuracy of your method. Discuss good volumetric technique. 2) Calculate the apparatus error for the method used. 3) Given the value calculated by the senior technician calculate your error and comment on this error in relation to the apparatus error of the method. In the titration‚ I used these available instruments to ensure my results would be as accurate as possible. Volumetric burette: This instrument was filled with the sodium hydroxide solution that would
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Conical flask‚ 100 cm3 Dropper Volumetric flask‚ 250 cm3 with stopper Funnel Volumetric pipette‚ 25 cm3 Standardized sulfuric acid‚ H2SO4(aq)‚ ~ 0.01 M Pipette filler Window cleaner solution White tile Methyl orange Procedures Part A Preparation of the diluted window cleaner solution 1. Wash the glassware with water and appropriate solutions. 2. Pipette 25 cm3 of the window cleaner solution to a 250 cm3 volumetric flask. 3. Add water to fill the flask
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standard solution. Standard Solutions are critical in chemistry because you need to have solutions with an EXACT known concentration and volume. Chemicals/Materials: solid sodium carbonate (Na2CO3) distilled water Apparatus: 250cm3 volumetric flask 250cm3 beaker Glass stirring rod Weighting boat or aluminium foil Dropping pipette Electronic scales to 2 DP Health and safety: Sodium carbonate powder may irritate the lungs if you breathe it in. Eye contact: Immediately flush the eye
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