mole ratio between copper (II) sulfate‚ CuSO4‚ and water‚ H2O? Mass of Hydrate 3.02 g Mass of Dry Sample - 2.11g Mass of Water 0.91 g MM CuSO4= 63.55 + 32.07 + 4(16.00)= 159.62 g/mol 2.11 g CuSO4 (1 mol CuSO4 / 159.62 g) = 0.0132 mol CuSO4 MM H2O = 2(1.01) + 16.00= 18.02 g/mol 0.91 g H2O (1 mol H2O / 18.02 g) = 0.0505 mol H2O 0.0132 mol CuSO4 : 0.0505 mol H2O → divide through by 0.0132 to get CuSO4 ● 4 H2O n=4 In the formula for copper
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(II) Sulfate‚ CuSO4‚ mass of 7.0015g with 2.0095g Fe or iron powder produced a solid precipitate of copper while the solution remained the blue color. Through this the appropriate reaction had to be determined out of the two possibilities. Through the use of a vacuum filtration system the mass of Cu was found to be 2.1726g which meant that through limiting reagent analysis Fe was determined to be the limiting reagent and the chemical reaction was determined to be as following:- CuSO4(aq) + Fe(s)
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ACADEMY Aim The aim of this investigation is to determine the formula of the complex ion formed from copper (II) ions and ammonia through colorimetry. Results Raw Data Table 1: The Effect of CuSO4:NH3 Volume Ratio (cm³) (±0.05) on Absorbance (±0.01) Independent Variable: Volume (cm³) (±0.05) CuSO4 NH3 0.00 0.00 1.00 9.00 1.50 8.50 2.00 8.00 2.50 7.50 3.00 7.00 4.00 6.00 5.00 5.00 Dependent Variable: Absorbance (±0.01) Trial 1 0.00 0.14 0.22 0.23 0.10 0.10 0.09
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through two different methods and which experimental method produces more accurate result. Two methods are electrochemistry using a Daniel cell and spectrometry by estimating concentration of complex solution. The color of anhydrous copper sulfate (CuSO4) is white because it reflects lights in visible region of spectrum. Once water is added‚ it changes to blue as the structure of the copper transitional compound becomes Cu(H2O)4 SO4 - H2O where four water molecules are bound to the copper ion and the
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solution is known as Beer’s law. The concentration of an unknown CuSO4 solution is then determined by measuring its absorbance with the Colorimeter. By locating the absorbance of the unknown on the vertical axis of the graph‚ the corresponding concentration can be found on the horizontal axis. The concentration of the unknown can also be found using the slope of the Beer’s law curve. PROCEDURE 1. Add about 30 mL of 0.10 M CuSO4 stock solution to a 100 mL beaker. Add about 30 mL of distilled water
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change is recorded over a period of time‚ the enthalpy change of the reaction can be experimentally determined. Assumption 1. Mass of H2O in 100cm3 of CuSO4 solution is 100g 2. Specific heat of solution is 4.18 kJ kg-1 K-1 which is the same as the specific heat of water 3. Heat evolved in the reaction will be absorbed by the CuSO4 solution 4. Maximum temperature that would have been reacted if no heat lost to surroundings can be calculated by extrapolation the graph plotted with temperature
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Data collection and processing Qualitative observation Before * Blue solution of copper sulfate * Grey zinc powder During * Blue color solution changes to greyish black * Heat is given out‚ so the surroundings become hotter. After * Grey powder remains on the sides of the cup * Precipitate formed at the bottom of the cup List of chemicals and apparatus used Chemicals used Copper sulfate solution‚ 1 mol dm-3 25g of zinc powder Apparatus needed
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nm is directly proportional to the protein concentation. Procedures • Mix 1ml of egg white solution and 10 drops of NaOH in the test tube. • Add 1 drop of CuSO4 solution. Mix well and record your observation. • Dissolve one tablet of aspartame or ½ sachet of Equal in 2 ml of water. • Add to the resulting solution 10 drops of NaOH and CuSO4 solution. • Mix well and record your observation. Compare the two results. What Is the principle involved in the biuret test? The Biuret Test is based on the
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water streams. The objective of is to evaluate the ability of the EFC process in reducing the volume of a 5 wt% CuSO4 aqueous waste water stream significantly while simultaneously producing potable (drinking) water. In order to evaluate this effectiveness‚ the yield and purity of only the ice product is investigated before and after a number of wash cycles. A 1000g solution of 5 wt% CuSO4 underwent crystallization for one hour with the use of ice crystal seeding and the agitation of a stirrer at
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Name: Serene Tan Subject: Chemistry SL Date: 5th December 2012 Title: The effect of concentration of electrolyte on the potential difference in voltaic cell. Aim: To investigate the effect of concentration of electrolyte of the potential difference in voltaic cell. Introduction: Chemical reactions involving the transfer of electrons from one reactant to another are called oxidation-reduction reactions or redox reactions. In a redox reaction‚ two half-reactions occur; one reactant gives
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