pipette paper with a black cross on it Chemicals required sodium thiosulfate solution (15 g/dm3) cobalt(II) chloride solution (0.1 mol) iron(III) nitrate solution (0.1 mol) copper(II) sulfate solution (0.1 mol) iron(II) sulfate solution (0.1 mol) What to do 1 Draw a cross on a piece of paper and put it underneath a 100 cm3 measuring cylinder‚ or use the cross from part 2‚ so it can be seen when looking down the cylinder. 2 Pour 50 cm3 of sodium thiosulfate solution into the measuring cylinder. 3 Pour
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reaction. Here are the chemical formulas of the reactants for each reaction: • sodium chloride – NaCl copper sulfate – CuSO4 • sodium hydroxide – NaOH copper sulfate – CuSO4 • sodium phosphate – Na2HPO4 copper sulfate – CuSO4 • sodium chloride – NaCl silver nitrate – AgNO3 • sodium hydroxide – NaOH silver nitrate – AgNO3 • sodium phosphate – Na2HPO4 silver nitrate – AgNO3 Answer: |Your Score
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Discussion Field observations and lab analysis indicated that‚ there are many types of damages that wall painting can undergo in the Komir temple. All building and decoration materials of Komir temple have been investigated concerning the contamination with soluble salts. Soluble salts represent one of the most important causes of stone decay that may precipitate on the external surface (“efflorescence’s”) or in proximity of the surface (“subefflorescence’s”) [Brai et al 2010]. The degradation induced
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number code throughout this lab. All three reactions are exothermic. 1) Dissolving solid sodium hydroxide in water (this heat is actually a “heat of solution” since no true chemical reaction occurs): NaOH (s) ---> Na+ (aq) OH¯ (aq)H1 2) Solid sodium hydroxide is dissolved in a hydrochloric acid solution: H+ (aq) Cl¯ (aq)NaOH (s) ---> Na+ (aq) Cl¯ (aq)O (l)H2 3) A solution of sodium hydroxide is mixed with a hydrochloric acid solution: H+ (aq) Cl¯ (aq)Na+ (aq)
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Electrolysis Electrolysis is the process by which ionic substances are broken down into simpler substances using electricity. During electrolysis‚ metals and gases may form at the electrodes. What is electrolysis? Ionic substances contain charged particles called ions. For example‚ lead bromide contains positively charged lead ions and negatively charged bromide ions. Electrolysis is the process by which ionic substances are decomposed (broken down) into simpler substances when an electric
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32° F. The temperature may be lower if super cooling occurs or if there are impurities present in the water which could cause freezing point depression to occur. Sodium chloride‚ also known as salt‚ common salt‚ table salt or halite‚ is an ionic compound with the formula NaCl‚ representing equal proportions of sodium and chlorine. Sodium chloride is the salt most responsible for the salinity of the ocean and of the extracellular fluid of many multicellular organisms. As the major ingredient in edible
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References: Asch‚ F.‚ Dingkuhn‚ M.‚ Wittstock‚ C.‚ Doerffling‚ K.‚ 1999. Sodium and potassium uptake of rice panicles as affected by salinity and season in relation to yield components. Plant Soil 207‚ 133–145. Ashraf‚ M.‚ McNeilly‚ T.‚ 2004. Salinity tolerance in Brassica oilseeds. Crit. Rev. Plant Sci. 23‚ 157–174. Baalbaki
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Emission Spectra of several metallic ions. Materials: Safety glasses 10 test tubes Test tube rack Paper Pencil 50 mL beaker Bunsen burner Nichrome wire Barium Nitrate Copper Nitrate Strontium Nitrate Lithium Nitrate Potassium Nitrate Sodium Chloride Calcium Nitrate Unknown solutions A‚B‚ & C Hydrochloric Acid Wash bottle (with distilled water) Procedure: 1. Label the test tubes with the names of the solutions and unknowns. 2. Place about 5 mL of each solution into each test tube
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presentation itself‚ it stated the impacts of road salts and deicers‚ the state uses on the roadways during the winter months. The most commonly used road salt is sodium chloride‚ which is also the most inexpensive and readily available. Recently after more than a half century of its widespread use in North America‚ the use of sodium chloride on the roadways have come under scrutiny by the environmental and scientific communities as well as regulators and legislators. The main residual effects
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Experiment # 1 Date: 18/12/13 Title: Chemical Properties of Alkanes. Aim: To test the reactivity of alkanes using cyclohexane as an example. Apparatus/Materials: Cyclohexane‚ liquid alkane‚ aqueous bromine‚ test tubes‚ light source‚ watch glass‚ splint‚ 0.1 MKMnO4‚ concentrated H2SO4‚ dilute H2SO4. Method: Combustion: 1. A watch glass was placed on a benched protection sheet in a fume cupboard and the extractor in the fume on. 2. 4 drops of cyclohexane was placed on the watch glass using
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