shells for their calcium carbonate. Marketable vinegar differs in its acetic acid concentration from 4-6%. Calcium carbonate reacts with the acetic acid in vinegar to produce carbon dioxide‚ water‚ and calcium acetate as represented by the equation: CaCO3 + 2HC2H3O2 CO2 + H2O + Ca(C2H3O2)2. The calcium carbonate reacts with the acetic acid in a 1:2 ratio. Therefore‚ for every one mole of calcium carbonate that reacts‚ 2 moles of acetic acid have reacted as well. Materials: 1. Broken eggshells
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This page intentionally left blank Copyright © 2008‚ New Age International (P) Ltd.‚ Publishers Published by New Age International (P) Ltd.‚ Publishers All rights reserved. No part of this ebook may be reproduced in any form‚ by photostat‚ microfilm‚ xerography‚ or any other means‚ or incorporated into any information retrieval system‚ electronic or mechanical‚ without the written permission of the publisher. All inquiries should be emailed to rights@newagepublishers.com ISBN (13) : 978-81-224-2652-6
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that we evaporate SiO2 in a dish and we had the mass of dish + the sample as 43.37 g the dish itself was 42.68 g and we got the mass of SiO2 as .69 g. Our final result was for CaCO3 we measured the mass of watch glass + filter paper and got 47.96 g and measuring again with the sample we got 55.06 g‚ after drying our CaCO3 mass was 7.1 g. As a total recovered mass we got 9.32 g from the initiate mass which was 5 g. The percent recovery is 186.4% and the error was 86.4%. Results and discussion After
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dilute if contains a small amount. Molarity Molarity is the number of moles of solute per litre of solution. It is abbreviated with the symbol M‚ and is sometimes used as a unit of measurement‚ e.g. a 0.3 molar solution of HCl. In that example‚ there would be 3 moles of HCl for every 10 litres of water (or whatever the solvent was). Molality Molality is the number of moles of solute per kilogram of solvent. It
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10/9/2012 5:00-7:45 Date of report written: 10/15/2012 Introduction: The purpose is to isolate caffeine from coffee by using the organic solvent dichloromethane (CH2Cl2) that is also referred to as direct contact. Calcium carbonate (CaCO3) is used to remove the tannins from the coffee. Afterwards an extraction is used to separate the organic layer (bottom) from the aqueous layer (upper). By using a rotary evaporator‚ it evaporates the organic solvent and forms the crude caffeine. Afterwards
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4. 5. Data Tables: Mass of crucible + M2CO3 | 21.427 g | Mass of crucible + M2CO3 (dried) | 21.325 g | Mass of crucible | 19.403 g | Mass of M2CO3 | 2.024 g | Mass of filter paper + CaCO3 | 2.572 g | Mass of filter paper | 0.904 g | Mass of CaCO3 | 1.668 g | Moles of CaCO3 | 0.0167 mol | Molar Mass of M2CO3 | 121.19 g/mol | Identity of M2CO3 | K2CO3 | Percent Error | % | Calculations and Post Lab Analyses 1. 2. 3. 4. The molar mass would be too high if
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Limestone is a sedimentary rock composed largely of calcium carbonate (CaCO3). Many limestones are composed from skeletal fragments of marine organisms such as coral or foraminifera. Limestone makes up about 10% of the total volume of all sedimentary rocks. The solubility of limestone in water and weak acid solutions leads to karst landscapes‚ in which water erodes the limestone over thousands to millions of years. Most cave systems are through limestone bedrock. Limestone has numerous uses‚ including
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EDTA solution was standardized using 10.18 mL calcium ion stock solution (1.000g/CaCO3)‚ ammonia/ammonium chloride buffer‚ and Eriochrome Black T as an indicator. Then‚ using the standardized disodium EDTA solution‚ an unknown sample (#94) was titrated. Finally‚ the results were compared with that of Tempe City’s pulic water supply. Results Table 1. | Standardization | | | Trial | Volume Delivered CaCO3 | Volume Delivered Na2EDTA | Molarity | 1 | 10.14mL | 24.30mL | 0.00417 | 2
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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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Back Laboratory Program SAFETY IN THE CHEMISTRY LABORATORY 786 Pre-Lab Extraction and Filtration 790 1-1 Mixture Separation 792 1-2 Water Purification 794 3-1 Conservation of Mass 798 4-1 Flame Tests 801 Pre-Lab Gravimetric Analysis 828 13-1 Separation of Pen Inks by Paper Chromatography 830 13-2 Colorimetry and Molarity 834 14-1 Testing Water 838 804 7-1 Separation of Salts by Fractional Crystallization 806 7-2 Naming Ionic
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