four carboxylic acid groups has an electron pair to donate to a metal ion center‚ making EDTA a hexadentate (“six-toothed”) ligand which forms an octahedral complex. Fig. 2. Ethylenediaminetetraacetic acid (EDTA). Fig. 3. EDTA4– chelating a calcium ion. REV 2012-02-13 COMPLEXOMETRIC DETERMINATION OF WATER HARDNESS PAGE 1 OF 4 CHM152LL LAB MANUAL COMPLEXOMETRIC DETERMINATION OF WATER HARDNESS
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Analysis of an Antacid In this lab report we will discuss the results of the ‘Determining the Most Effective Antacids’ lab. In this lab we tested different brands of antacids to find out which will be the most effective at neutralizing acids. We will test this by seeing how much drops of hydrochloric acid (HCl) are required to neutralize a certain amount of the antacid. Antacids are used to resist heartburn. We sometimes use them to treat this because antacids are a mild base that can neutralize
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POWDERED MARBLE AS ALTERNATIVE TO COMMERCIAL CERAMIC TILES Class Project in English 104 (Technical Writing) Abstract This study determined whether powdered marble can be used as substitute to ceramics in the manufacture of commercial tiles. It especially determined and compared the water absorption‚ crazing resistance‚ chemical resistance‚ and breaking strength of 59%-50% and 75%-25% powdered marble tiles‚ and the commercial ceramic tiles. The Static Group
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those of Folk (1959‚1962) and Dunham (1962). Both classifications subdivide limestones primarily on the basis of matrix content. Most limestones are classified by Folk allochemical rocks if they contain over l0% allochems (transported carbonate grains). Based on the percentage of interstitial material‚ the rocks may be further subdivided into two groups: sparry allochemical limestones (containing a sparry calcite cement of clear coarsely crystalline mosaic calcite crystals) and microcrystalline
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Bubbling Cabomba pondweed Teaching Notes Introduction Like many other water plants‚ Cabomba has specialised tissue called aerenchyma that allows gases to diffuse inside the plant. Aerenchyma provide buoyancy and allows oxygen transport to the submerged roots that may otherwise be in hypoxic (low oxygen) conditions. If you cut through the aerenchyma‚ oxygen can escape. This can be made use of this in the classroom to show how the rate of photosynthesis is affected by light intensity or by
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neutralizes the acid. In this experiment the amount of acid neutralised by one tablet is found. This may be considered a direct measurement of the effectiveness of the tablet. Requirements for the experiment:-[pic] • Indigestion Tablets Calcium Carbonate (CaCO3) • Gas Jar • Clamp Stand • Hydrochloric Acid (HCL) solutions labelled 20‚ 30‚ 40‚ 50 60gdm-3 ( these can be 0.50‚ 0.75‚ 1.00‚ 1.25‚1.50 mol dm-3) • Trough or container • Measuring cylinder • Timer. •
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Marble Chip Investigation Method 1.Set up the equipment as diagram shows. The measuring cylinder must be filled with water and then inverted into the tub. 2.Measure the quantity of hydrochloric acid and marble chips to the decided amount. Add water to the acid to change the concentration to what you need. 3.Take note of the amount of water in the measuring cylinder. 4.Put the marble chips and hydrochloric acid into the conical flask. Replace the bung and start the stopwatch. 5.Once the decided
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Aim: To find the solubility and the solubility product of calcium hydroxide. Theory: Define‚ with equation‚ the solubility product. Find‚ from literature‚ the solubility product of calcium hydroxide at 25oC. Experimental: Reagents: solid calcium hydroxide‚ water‚ 0.1 moldm-3 hydrochloric acid Apparatus: Procedure: 1. An empty bottle was weighed. Then the empty bottle was weigh with 1g calcium hydroxide. 2. 100 cm3 of distilled water was added to the bottle. For about
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CaCO3 in eggshell 1 Candidate Name: Kamalia‚ Ujjwal Candidate Number: 001350-035 Teacher’s Instruction: Carry out an experiment to determine the %of CaCO3 in egg shell. Research Question: What percentage by mass of an egg shell is Calcium Carbonate ? Variables: 1. 2. 3. Principle used: The principle of back titration is used to determine the percentage by mass of an egg shell. Excess of in is added to a known mass of powdered egg shell. The solution formed is diluted
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was completed using an approximately .7340g Na2EDTA/500mL solution. A 1.000g/L calcium ion solution was used as the primary standard with approximately 3mL of ammonium chloride as a buffer and Erichrome Black T as the indicator solution. Three titrations were performed to ensure accuracy of the molarity of the Na2EDTA solution. The 1.000g/L calcium ion solution had to be converted to M so 1g/L/100.1g=.009990M calcium ion solution. Titration 1: 10.00mL CaCO3; .00999MCaCO3X.0100L= .0000999mol CaCO3
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