Br and 5 & 6 had 10 drops of I. Then in flask one 10 drops of sodium bromide were distributed into it. Next ten drops of sodium iodide were put into flask 2‚ followed by putting 10 drops of sodium chloride into flask 3 and 10 drops of sodium iodide into flask four. Afterwards 10 drops of sodium chloride and 10 drops of sodium bromide were put into flasks 5 & 6 respectively. A cork was placed on the top of each of these flasks so outside air wouldn’t interfere with the reaction and observations were
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is standardized with a solution of a known conductivity. The ratio of a measured conductivity toward the standard solution is the ratio of length(l) towards cross section (A) of the cell. This ratio cell is call the cell constant. Use potassium chloride with a known conductivity as a standard solution. The conductivity measurements are not appropriate to compare between two electrolyte solutions because of the high dependant towards solution concentration. The molar conductivity (Λm) measurements
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plastic 1 Magnifier‚ dual 1 Pencil‚ marking 1 Thermometer-in-cardboard-tube 1 Well-Plate-24 In the Experiment Bag: LeChatelier’s Principle 1 E.D.T.A.‚ .15 M (Na2EDTA) - 2 mL in‚ Pipet 1 Hydrochloric Acid‚ 6 M - 2 mL in Pipet 1 Magnesium Chloride‚ 2 M - 3 mL in Pipet 1 Phenolphthalein Solution‚ 1% - 0.5 mL in Pipet 2 Pipet‚ Empty Short Stem 1 Sodium Bisulfate Crystals - 0.5 g in Vial 1 Sodium Bisulfate‚ 0.1 M - 4 mL in Pipet 1 Sodium Hydroxide‚ 1 M - 2 mL in Pipet 1 Sodium Sulfate‚
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A. WORK-OUT PROBLEMS: Write formulas for the following: calcium nitrate phosphorous pentafluoride aluminum carbonate strontium hydroxide methane potassium oxide lithium chloride barium sulfate phosphate ion dinitrogen tetroxide Give the complete electron configurations of: S‚ O2-‚ and Mn. For the following molecules/ions‚ give the Lewis structure‚ molecular geometry‚ and electron pair geometry: NO2- SF4 Write Lewis structures to represent all resonance forms of CO32-
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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 salt
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Isotonic environments are preferred by most microbes for the most advantageous growth‚ although some live in slightly hypotonic solutions. (Alonzo‚ 2008) Growth in NaCl Solutions Samples of S. cerevisiae and S. epidermidis were placed into sodium chloride (NaCl) solutions of 1‚ 7 and 15 percent which were supplied in the lab kit. The S. cerevisiae results are as follows. After 24 hours of observation there was a moderate amount of growth in the 1% NaCl solution which had a cloudy overall appearance
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the vinegars have been diluted by working out their concentrations. Scientific Background: Vinegar is an acid and there fore can be neutralised by an alkali. Acid + Alkali à salt + water Hydrochloric acid + Sodium Hydroxide à Sodium chloride + water Vinegar is a weak acid and therefore it only partially ionises in solution. CH3COOH ßà CH3COO- + H+ An alkali such as Sodium Hydroxide has a formula NaOH. If the alkali is strong then it ionises fully in solution. NaOH ßà Na+
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reaction. It is also to learn concepts of solubility and the formation of a precipitate. The Experiment and Observation: Weigh out your 1.0g of CaCl2-2H20 and put it into the 100mL beaker‚ add your 25mL of distilled water and stir to form the calcium chloride solution. Next‚ use stoichiometry to determine how much Na2CO3 and put it into a small paper cup. Then add the 25mL of distilled water to make the sodium carbonate solution. Mix the two solutions in the beaker and a precipitate of calcium carbonate
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SINGAPORE POLYTECHNIC SCHOOL OF CHEMICAL & LIFE SCIENCES CP 4001: ANALYTICAL & PHYSICAL CHEMISTRY Experiment 4: Gravimetric Analysis Prepared for: Mr Goh Tong Hng Submitted by: Ng Hui Shan (0900931) DBS/FT/1A/02 26th May 2009 CONTENTS 1. Synopsis 3 2. Objectives 4 3. Theory 1. Experimental Procedure 4 2. Stoichiometric Calculation 7 4. Procedure 7 5. Results & calculations 1. Amount of
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In our search for prosperity‚ growth and success‚ we are destroying the system that we as human are completely dependent upon. Population growth‚ water-intensive agriculture and economic development are using water faster than it can be replenished. Our Earth is a place where beauty exists‚ a place where 6.6 billion people and 15 million other species live‚ a place filled with 1.4 cubic kilometers of water. Although 70% of the planet’s surface is blanketed with deep oceans water‚ freshwater only
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