Analysis of Commercial Bleach Lab I. Purpose In this experiment‚ the amount of sodium hypochlorite in a commercial bleach will be determined by reacting it with sodium thiosulfate in the presence of iodide ions and starch. A solution of sodium thiosulfate of known concentration will be added to the bleach using a buret in a titration procedure. The disappearance of the dark blue color of the starch-iodine complex will signal the end point. II. Procedures Pre-Lab Questions 1. What is
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involves some important laboratory techniques‚ when carrying out a synthesis reaction. When solutions of potassium iodide and lead (II) nitrate are mixed together crystals of lead iodide are formed according to the following chemical equation: 2 KI (aq) + Pb(NO3)2 (aq) → PbI2 (s) + 2 KNO3 (aq) Procedure: Lead compounds are toxic. If you get any of the solution or solid on your hands‚ wash your hands immediately. Clean
Free Stoichiometry Chemical reaction Chemistry
solution. Hypothesis: If the halide ions react‚ then the production of precipitate and complex ions will be recognizable. Materials: * * 24-well microplate * AgNO3‚ 0.1 M * Ca(NO3)2‚ 0.5 M * Gloves * KBr‚ 0.2 M * KI‚ 0.2 M * Lab apron * Na2S2O3‚ 0.2 M * NaCl‚ 0.1 M * NaF‚ 0.1 M * NaOCl (commercial bleach)‚ 5% * NH3(aq)‚ 4 M * Safety goggles * Starch solution‚ 3% * Thin-stemmed pipets (12) Procedure: 1.) Put on safety goggles
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immediately after contact. Homogeneous| E.|Blue dye + NaOCl||Stays blue. Homogeneous| | with the 1 drop of HCl||Mixes and turns a bluish green color. Homogeneous| F.|NaOCl + KI||Slightly yellowish tint to the solution. Homogeneous| | with 1 drop of starch||Turned the slim yellow into a slight brown tint. Homogeneous| G.|KI + Pb(NO3)2||Turns yellow immediately after contact with little yellow powdery chunks. Heterogeneous| H.|NaOH + phenolphthalein||Turns a dark pink/purple and expands. Homogeneous|
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prepared directly by dissolving iodine in water because iodine is too volatile so it is almost impossible to avoid loss while the solution is being prepared. Therefore iodine is prepared in situ by mixing pure potassium iodate (KIO3 ) and potassium iodide (KI) in acidified medium. IO3- + 5I- + 6H+ → 3I2 + 3H2O The excess iodine that has not reacted with ascorbic acid in fruit juices (vitamin C) is then back titrated by standardized sodium thiosulphate solution. Iodine can be decolourized
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and Discussion Principle behind the experimental design Results are tabulated and with table number and title Graph‚ Drawings (Figure # and Title) Conclusion Recommendation Experimental 1.0 A. Reagents - Anhydrous ZnCl2 - 6M H2SO4 - 10% KI - 6M NaOH - 10% K2Cr2O7 - conc. HCl - DNPH reagent (potential carcinogen!) - unknown sample B. Materials - Small test tube - Hot Plate - 250 mL beaker - Pasteur Pipettes 2.0 Procedures Chemical Analysis was done for
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toys. It was unfortunate for the workers‚ but OAC had to make a decision because they could not find a better way to stay completive and lower cost. Assuming that the NYT reporting was accurate‚ is it ethical for the OAC to continue working with Kin Ki? Yes‚ I believe the only way for OAC to keep working with the company is to make sure the
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file for finding out about the budget of your municipal corporation in the major items on which money was spent? 3. Make a model on tsunami. 1. Grishma Ritu main apne swasthya ka dhyan rakhne hetu aap kaun se prayas karenge. 2. Bijli ki avyavastha ki aur dhyan aakarshit karte huye bijli board ke adhikari ko patra likhiye. 3. 10 muhavaren ka prayog karte huye swarachit kahani likhiye MAKE A PPT ON “ANY SIX” OF THE FOLLOWING TOPICS & ALSO SHOW IT
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the same mistake. If you make a mistake in a one-step‚ you might injure the person and twist the wrong muscle. Being a high black belt means to have a good and positive attitude. If you be lazy and don’t do a loud ki-hap‚ the lower belts will do what you do and be lazy and not ki-hap. If you are asked to lead stretching or counting‚ say a loud‚ “yes sir!” and do not complain. You should show leadership when you do stretching exercises or kicking because if you do not count loudly‚ the class
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NINJA HATTORI NARATTOR- EAK DIN KANACHI‚ SHISHIMANU‚ AUR SHINZO EAK CAKE KI SHOP KE SAMNE NE CAKE KHA NE ICCHA KAR RAHE THE. KANACHI- VAAH SHINZO KYA CAKE HAI. MERA YEH CHOCOLATE CAKE KHANE KA MANN KAR RAHA HAI. SHINZO- ha‚ KANACHI TUM SAHI KAHE RAHE HO. NARATTOR- Untie DEAR MAIN DUKANDAR AATA HAI. DUKANDAR- DEKHO BACCHO AGAR TUME YEH CAKE KHANA HAI TOH TUMHE MERI DUKAAN KA DHYAAN RAKHNA PAREGA. MAIN KISE KAAM SE BAHAR JA RAHA HYUN. DHYANN RAKHNA. SHISHIMANU- BYE UNCLE AAP HAMARI CHINTA
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