produced on evaporation‚ but rather in the form of ions‚ the basic elements and the acid radicals being separated‚ nevertheless it is customary and convenient to consider them as combined into the form of salts. Among these‚ common salt‚ or sodium chloride‚ makes up the bulk of the material‚ being nearly 78 percent of the total mass of salt‚ or over 27 mille (thousand) of the salinity (which is taken as 35 in round numbers). In the accompanying table the composition of sea water salts is given
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well. When NaCl solution is dissolved in water‚ the solution conducts very well‚ because the solution contains ions. The ions come from the table salt‚ whose chemical name is sodium chloride. Sodium chloride contains sodium ions‚ which have a positive charge‚ and chloride ions‚ which have a negative charge. Because sodium chloride is made up of ions‚ it is called an ionic substance. After completing the experiment and plotting each conductivity value I found that as the NaCl increased in concentration
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quantity of magnesium required to ensure it is in excess. c) Calculate the temperature change if only 0.8 g of magnesium is added. 3. When 5.73 g of sodium chloride (NaCl) dissolves in 100 cm3 of water‚ the temperature of the water fell from 22.4 oC to 19.8 oC. Calculate the enthalpy change of the reaction. 4. When 2.3 g of magnesium chloride dissolves in 200 cm3 of water‚ the temperature rose by 3.4 oC. Calculate the enthalpy change for the reaction. 5. If 50 cm3 of 0.1 moldm-3 HCl and
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Determination of the Equilibrium Constant for Ferric Thiocyanate In this laboratory exercise‚ the equilibrium constant(Kc) for the reaction between the Ferric Ion (Fe3+) and the Thiocyanate Ion (SCN-) was determined. After measuring the absorbance of the Ferric Thiocyanate‚ and carrying out some calculations; it was determined that Kc=130.81M Introduction: Chemical equilibrium is established when a reaction exists in a state where the forward reaction rate is equal to its reverse reaction
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EXPERIMENT II: SEPERATION OF A MIXTURE OF SOLIDS PURPOSE: The purpose of this experiment was for me to become familiar with the separation of mixtures and solids and to learn separation techniques based on the chemical properties of a substance. PROCEDURE: Before beginning‚ I set up a data table to record data from the experiment. 1. Separating out the Iron a) I used my digital scale to determine the mass of my weighing dish. b) I emptied the entire mixture of solids from the plastic bag into
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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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to be acids‚ however this can be explained by the spotplate used to hold the compounds not being properly cleaned‚ leading to cross contamination. All acids turned the blue litmus paper red. Our hypothesis about bases was correct‚ as the only was Sodium Hydroxide‚ and it turned the red litmus paper blue. Sources of Error Cross contamination of substances from unclean materials leading to inaccurate
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The global market for polyvinyl chloride (PVC) is expected to reach USD 79.11 billion by 2020‚ according to a new study by Grand View Research‚ Inc. Increasing construction and infrastructure spending in emerging markets of Asia Pacific and Latin America is expected to remain a key driving factor for global PVC demand. In addition‚ growth of global automotive industry is also expected to have a positive influence on the market. Volatile raw material prices coupled with the stringent regulatory scenario
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tablet daily (morning) Chlorpromazine 50mg tablets – one tablet 3 times daily (morning‚ midday‚ night) Chlorpromazine 100mg tablets – one tablet 3 times daily (morning‚ midday‚ night) Valproate Semi sodium 500mg tablets – one tablet 3 times daily (morning‚ midday‚ night) Sodium Chloride MR 600mg tablets – 2 tablets 4 times daily (morning‚ midday‚ teatime‚ night) Promethazine HCI 25mg tablets – one tablet daily (night) Procyclidine 5mg tablets – one tablet daily (morning) Lorazepam
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calculations to determine the quantities (masses‚ volumes) of reactants and products involved in chemical reactions. It is a very mathematical part of chemistry. In this experiment‚ you will react a known amount of sodium carbonate solution with a known amount of calcium chloride solution. The skeletal (unbalanced) equation for the resulting double replacement reaction is: Na2CO3(aq) + CaCl2(aq) Æ NaCl(aq) + CaCO3(s) Note that three of the chemicals have their states or phases designated
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