Safety measures in the chemistry laboratory The mentors are responsible for instructing the competitors as to the risks to which they are subjected when working in a chemistry laboratory‚ as well as to the basic safety measures‚ and first aid. Specific behavioral and safety measures must be obeyed to prevent accidents. Rules in the lab: * Use protective clothing all the time (e.g. lab coat and safety glasses) * Use a hair band to keep your hair away from your face. *
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Na2CO3. After figuring out how many g of Na2CO3 I needed the next step was to weigh out the 0.7g Na2CO3 and pour into a paper cup along with 25mL of distilled water and stir to form the solution sodium carbonate. After both solutions were made and in their separate containers the next step was to pour the sodium carbonate solution into the beaker of the calcium chloride solution and watch the calcium carbonate precipitate form. After the Calcium Carbonate Precipitate was formed the next step was
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torch. The data we found was that it turned blue after a period of time. The reaction was CoN- OH. The second station was very interesting. The procedure was to place 3 small drops of cobalt nitrate into a test tube in the rack. Place 6 drops of sodium hydroxide in the second test tube. Pour test tube into test tube one. Record the results. Dump the contents of the first tube into the filter funnel that has already been set up for you. Rinse both tubes and return to the test tube holder. Leave all
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ingredients: Complex Sodium Phosphates and sodium carbonate‚ Nonionic surfactant and chlorine bleach‚ sodium silicate‚ sodium sulfate. (D) What do these ingredients do in the mixture? When tested as a whole can be considered an eye irritant. Complex Sodium Phosphates and sodium carbonate are used as a water softener. Nonionic surfactant and chlorine bleach is a cleaning and water spot preventive agent. Sodium silicate is a dishwasher and china protection agent. Sodium sulfate has multiple jobs
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Hydrochloric acid‚ HCl‚ 6 M‚ 125 mL* Nitric acid‚ HNO3‚ 6 M‚ 125 mL* Ammonia‚ NH3‚ 6 M‚ 125 mL* Sulfuric acid‚ H2SO4‚ 6 M‚ 125 mL* Acetic acid‚ CH3COOH‚ 6 M‚ 125 mL* Sodium chloride‚ NaCl‚ 0.2 M‚ 100 mL* Sodium carbonate‚ Na2CO3‚ 0.2 M‚ 100 mL* Sodium hydroxide‚ 6 M‚ 100 mL* Sodium sulfate‚ Na2SO4‚ 0.2 M‚ 100 mL* Sodium nitrate‚ NaNO3‚ 0.2 M‚ 100 mL* Barium chloride‚ BaCl2‚ 0.1 M‚ 100 mL* Barium hydroxide‚ Ba(OH)2‚ 5 g* Potassium thiocynate‚ KSCN‚ 0.1 M‚ 100 mL* Potassium ferrocyanide
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Mr. Bunsen’s Rf calculations were the closest to the Rf calculations of the unknown. In our sodium hydroxide solution the compounds that were chromatographed were separated the furthest and produced Rf calculations for all of the suspects except Ms. Buchner. Changing the solvent allowed us to have a better resolution of the separated components. Acetic acid separation for the samples were very small sodium chloride solution was also similar to Acetic acid. Conclusion The unknown of NaCl and Acetic
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Ordinary Level 5070/31 CHEMISTRY Paper 3 Practical Test October/November 2010 CONFIDENTIAL INSTRUCTIONS *4711088250* Great care should be taken to ensure that any confidential information given does not reach the candidates either directly or indirectly. The Supervisor’s attention is drawn to the form on page 7 which must be completed and returned with the scripts. If you have any problems
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the reaction of aluminum sulfate and sodium hydroxide contains which of the following species? a) 3Al3+(aq) b) OH–(aq) c) 3OH–(aq) d) 2Al3+(aq) e) 2Al(OH)3(s) ANS: c) 3OH–(aq) PAGE: 4.6‚8 6. Which of the following is a strong acid? a) HF b) KOH c) HClO4 d) HClO e) HBrO ANS: c) HClO4 PAGE: 4.2 7. Which of the following is not a strong base? a) Ca(OH)2 b) KOH c) NH3 d) LiOH e) Sr(OH)2 Ans: c) NH3 Page: 4.2 8. When sodium chloride and lead(II) nitrate react
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14. Stirring rod 15. Test tube rack 16. Graduated cylinders 17. Funnel‚ filter paper‚ and holder for funnel B. Procedure: 1. Equilibrium in a Saturated Solution You will investigate the equilibrium in saturated sodium chloride solution: NaCl(s) (( Na+(aq) + Cl-(aq) Pour some solid NaCL into a test tube and fill the tube about ¾ full of distilled water. Cork and shake to form a saturated solution. If all the NaCl dissolves‚ pour some additional
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1M = 5.105g = 0.1N | Potassiun hydrogen iodate KH(IO3)2‚ FW = 389.92‚ Eq. 73.07g/l 250ml 0.1M = 9.75g = 0.1N | Sodium carbonate Na2CO3‚ FW = 106‚ Eq. =53g/l 250ml 0.05M = 1.325g = 0.1N | Sodium hydroxide NaOH‚ FW = 40‚ Eq. = 40g/l 250ml 0.1M = 1.0g = 0.1N 1 liter 0.1M soln = 4g = 0.1N | Sodium oxalate Na2C2O4‚ FW = 134.00‚ Eq. =134g/l 250 0.1M = 3.35g = 0.1N | Sodium tetraborate NaB4O7.10H2O‚ FW = 381.37‚ Eq. =190g/l 250ml 0.05M = 4.762g =0.1N | Succinic acid HO2CCH2CH2CO2H
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