bicarbonate. Two different liquid layers formed‚ one with an aqueous solution and the other with the organic dichloromethane. The aqueous solution was then separated into one container and the dichloromethane solution into another. The lab then added HCl to the aqueous solution until it was acidic‚ reaching a pH ≤ 2. The aqueous solution was then cooled and the aspirin precipitate was separated. To isolate the unknown‚ the lab heated the dichloromethane
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pKa’s of 2.14‚ 6.86‚ and 12.4. The ionic form that predominates at pH 3.2 is: A) H3PO4. B) H2PO4–. C) HPO42–. D) PO43–. E) PO-. 6. The aqueous solution with the highest pH is: A) 1 M HCl. B) 1 M NH3 (pKa = 9.25). C) 0.5 M NaHCO3 (pKa = 3.77). D) 0.1 M NaOH. E) 0.001 M NaOH. 7. Titration of valine by a strong base‚ for example NaOH‚ reveals two pK’s. The titration reaction occurring at pK2 (pK2 = 9.62) is: A) —COOH + —NH2 → —COO−
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Study material CHEMISTRY CLASS: XII KENDRIYA VIDYALAYA SANGATHAN LUCKNOW R E G I O N 2009-2010 Study Material Class XII -Chemistry SHRI RANGLAL JAMUDA IAS‚COMMISSIONER CHIEF Patron KENDRIYA VIDYALAYA SANGTHAN NEW DEHLI SHRI M.S Chauhan Asst. Commissioner Patron Kendriya Vidyalaya Sangthan Lucknow Region SHRI S.S. Rawat Guidance Smt. A.N Siddiqui (Education officer) (Education officer) SHrI K.‚M. Bhatnagar (Education officer) Co-ordinator SHRI. T. Singh Principal K.V. No. 2
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Conservation of Mass 9/27/10 Block A5 Materials * Baking Soda (NaHCO3) * Vinegar (acetic acid‚ CH3COOH‚ solution) * Ziploc bags * Weight boats * 100mL graduated cylinder * 150mL beaker * 400mL beaker * Balance The purpose of this lab was to find the mass of the products and reactants and to show a chemical reaction between them. I will use our results to apply what we’re learning in class which consists of: intensive and extensive properties‚ physical and
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turned off to let the mixture to cool to room temperature. The contents of the mixture were then added to a separatory funnel and was wash with the organic layer with water (3x15ml) and then with 5% NaHCO3 (15ml). The top layer should be the organic layer‚ while the bottom should be water and NaHCO3. The organic layer was then clean in a flask (100ml) ‚ was distilled‚ while observations were made between temperature
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Chemistry 11 Final Examination Review - Answers Part A - True or False. Indicate whether each of the following statements is true or false. Correct the false statements. F 1. The mass of an electron is equal to the mass of a proton. The mass of an electron is less than the mass of a proton. T 2. The mass of a proton is approximately equal to the mass of a neutron. T 3. The atomic number represents the number of protons in a nucleus. T 4. The proton has a mass of approximately
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Peroxidase because salt contains Na ions which attaches to the allosteric site changing the shape of the enzyme to fit a substrate. Materials: • Peroxidase (enzyme in potato) • Hydrogen peroxide‚ 3% • A strong acid‚ pH3 (lemon juice‚ or HCL) 0.5 • A
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We were employed (used from) other organic or inorganic bases such as piperidine‚ 1‚8-diazabicyclo[5.4.0]undec-7-ene (DBU)‚ NEt3‚ KHCO3‚ NaHCO3‚ K2CO3 and Na2CO3‚ in instead of morpholine for the first step of reaction‚ followed by ??equivalent of morpholine in acetonitrile (entries 2-8). We observed the best yield of thiophene 4a was obtained‚ when NEt3 used as the base of the first step
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Chapter 6 – Properties of gases lecture notes 1. Gas phase Gases have neither definite shape or volume 1) volume changes with pressure 2) volume changes with temperature 3) gases are miscible 4) gases are generally MUCH less dense than liquids 2. Atmospheric pressure 1 atm = 760 torr (mm of Hg) F= ma F = force m = mass a = acceleration P = F/A - ma/A P = pressure
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the smell. Excess acid in the stomach causes indigestion‚ so it can be neutralised with a weak base called an antacid. An example of an equation using this format is when hydrochloric acid meets sodium hydroxide to form sodium chloride and water: HCl + NaOH NaCl + H2O Adding an acid to a base does not necessarily mean that the product is automatically neutralised. The strength of each of the reactants must be matched so that all the ions released by the acid find a place with the base. A strong
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