7% | Giang and Kristen | 1.43 x 10-5 | ± 2.64 x 10-6 | -10114.3% | Alicia and Dan | 7.94 x 10-6 | ± 5.06 x 10-6 | -5571.4% | Uncertainties: 10 mL volumetric flask | ± 0.02 | 25 mL volumetric flask | ± 0.03 | 1 mL volumetric pipet | ± 0.006 | 5 mL volumetric pipet | ± 0.01 | 4 mL volumetric pipet | ± 0.015 | 3 mL volumetric pipet | ± 0.010 | 50 mL graduated
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Aim: determine the mass of calcium carbonate in chicken eggshells and hence its percentage by mass Apparatus Uncertainty 25.00 cm3 pipette ± 0.03 cm3 50.00 cm3 burette ± 0.05 cm3 250.0 cm3 volumetric flask ± 0.3 cm3 50.0 cm3 measuring cylinder ± 0.5 cm3 Electronic balance ± 0.01 g Uncertainty of apparatus Measurement Mass of eggshell = 3.15 ± 0.01 g Volume of HCl added = 50.00 ± 0.5 〖cm〗^3 Volume of solution = 250.0 ± 0.3 〖cm〗^3 Volume of NaOH pipetted = 25.00 ± 0.03 〖cm〗^3
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Evaluation of procedures: |Precision |The precision of each of the measurements you made is indicated by the % uncertainty calculated. | |Accuracy |The accuracy of an overall result (concentration of acid) means how close it is to the ‘true’ value. | | |It is possible to make very precise measurements but still end up with an inaccurate result because of a weakness | |
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tartaric acid (diprotic acid) Materials 4 x 100mL conical flasks 50mL burette rubber bulb 1 x 200mL beaker white tile retort stand 20mL volumetric pipette volumetric flask stopper 300mL distilled water marker 40mL 0.3M food acid burette clamp 0.1M sodium hydroxide magnetic flea magnetic stirrer glass funnel 1 x 200mL volumetric flask phenolphthalein 4 x 50mL beakers Method Part A: Making the food acid Place distilled water into a 25mL beaker Rinse the 20mL pipette
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water. If acid isn’t added the solution will quickly start to turn yellow due to formation of MnO2. If this happens anyway‚ add some more sulphuric acid to reverse the process. The solution should be clear with a slight green tinge. Chapter 15 – Volumetric analysis (Redox titrations) To prepare a standard solution of ammonium iron sulphate and use this solution to standardise a solution of potassium permanganate. Potassium permanganate (KMnO 4 ) is a powerful oxidizing agent and is a deep purple
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molecular weight of sugar‚ I found it to be 342.30 g‚ not 331.23 g‚ however‚ in my calculation I used 15.00 g as the molecular weight of O2‚ whereas online 16.00 g was used. Eight8 g of sugar were placed on the scale‚ and then transferred into the volumetric flask (Table 8 shows the calculations of the molecular weight‚ moles‚ mass‚ volume and molarity recorded before doing so). Distilled water was added to the sugar until a total of 25mL were in the flask. Then the flask was capped‚ and the solution
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* Phenolphthalein * Distilled water * Two 100mL beakers * 250mL beaker * 100mL volumetric flask with stopper * 50mL buret * 10mL volumetric pipet * Pipet pump * Retort stand * Buret clamp * Funnel * Erlenmeyer flask Procedure 1. Obtain about 30mL of vinegar in a clean‚ dry 100mL beaker. 2. Pipet one 10.00mL portion into a clean 100mL volumetric flask and dilute to the mark. 3. Stopper and invert several times to mix thoroughly. 4.
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BACK TITRATION- DETERMINATION OF THE CARBONATE CONTENT IN GARDEN LIME NAME: OSEI BONSU ERIC ID: 3906409 EXPERIMENT: I.2.2.1.
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and 8.0 hours into tubes containing 0.5 ml of 2% EDTA solution to inhibit blood coagulation. Plasma was obtained from blood through centrifugation for 20 min at 3500 resolution per minute. Plasma supernatant was transferred to two groups of 5.0 mL volumetric flasks. The procedure was performed as described under “LVD‚ CBD and ETC analysis spiked human plasma” and the peak area of LVD‚ CBD and ETC was measured. By using the corresponding equations of regression‚ the accurate concentration of drugs in-vivo
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Determination of nitrite and phosphate Mech-1103 assignment 2 C.SUNGKUR 10/20/2016 STUDENT ID: 1615715 Faculty of engineering Title: Determination of concentration for unknown solutions of nitrite and phosphate. Author: C. SUNGKUR Student id: 1615715 Date of submission: 20/10/2016 Submitted to: Mr. Y.SEECHURN ABSTRACT When primary aromatic amine and nitrous acid react together‚ it results in a diazonium compound and this process is called diazotization
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