PERIOD:_________ Prelab 1. A 6.00g sample of calcium sulfate hydrate (CaSO4.x H2O) is heated until all the water is driven off. The anhydrous compound has a mass of 4.77 g. Calculate the value of x in the formula. 2. For the data in problem number 1 above‚ what is the mass percent water in the hydrate? 3. Calculate the number of grams of water that could be obtained by heating 2.00 g of sodium sulfate decahydrate (Na2SO4.10 H2O). Hydrates Analysis
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is found by weighing before and after heating to find the mass of the water then using the moles calculations to find x. The source I have used is: http://www.rsc.org/learn-chemistry/resource/res00000436/finding-the-formula-of-hydrated-copper-ii-sulfate?cmpid=CMP00006780 1. Weigh the empty crucible‚ recording the weight‚ then add one spatula of them magnesium sulphate.
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on the clay triangle and heated with the Bunsen Burner for 3 minutes. 3. After this‚ the crucible and crucible cover were allowed to cool and were massed. 4. After getting the mass of the empty crucible and crucible cover‚ 3 grams of magnesium sulfate crystals were added to the COOL crucible. 5. The crucible‚ cover and hydrated salt were then massed all together. 6. After this‚ the crucible (containing the hydrated salt) and crucible cover (slightly askew) were placed on the clay triangle and
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(which should contain only the 4-phenylphenol) through the neck of the separator funnel into a small Erlenmeyer flask. If any water droplets are visible‚ remove them before adding the drying agent. Add a small amount of anhydrous sodium sulfate (or magnesium sulfate) to the flask. Let the mixture stand for 5 min. occasionally swirling it gently. 7) Decant or pipette the organic liquid away from the drying agent and place it in a clean‚ dry Erlenmeyer flask. Place it in the hood to allow the ether
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second centrifuge tube). Now wash (microscale) the combined extracts with saturated NaCl solution (5mL)‚ then with 10% aqueous potassium carbonate (5mL)‚ then with saturated NaCl solution (5 mL) again. Dry the organic layer with anhydrous sodium sulfate. Decant the organic layer into a small beaker and concentrate to roughly 0.2 mL by evaporation in the hood (do not apply heat!). If the sample goes to dryness‚ re-dissolve in hexane (0.2 mL). *Set aside a small amount of your crude
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shaken to mix the layers. The lower organic phase was drained into the Erlenmeyer flask and the aqueous phase out of the funnel. After that‚ the organic layer was returned to the separating funnel and washed with 15% NaCl solution. Anhydrous sodium sulfate was used as the drying agent and allowed the solution to stay for 15 minutes. The Erlenmeyer flask was weighed and the pipet was used to transfer the solution from the drying agent to the flask. Finally‚ the hood was used to remove the dichloromethane
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Experiment #4A- A Separation and purification Scheme Amena Alkeswani‚ PHCC Dhanlal Murally‚ PHCC September 27‚ 2012 Abstract: There are millions of different organic compounds. Most of them are found in mixtures and in order to achieve a pure form they need to be separated‚ isolated‚ and purified. However‚ there are endless numbers of possible mixtures‚ which make it impossible to have a pre-designed procedure for every mixture. So chemists often have to make their own procedures. The purpose
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Title: Synthesis and Reaction of halogenoalkane‚ 1-bromobutane Aim: To prepare 1-bromobutane and investigate some of its reactions Materials and Apparatus: • Eye protection • Distillation Kit • Thermometer • Measuring cylinder • Teat pipette • Rack with 3 small test tubes • Beaker Chemicals: • Butan-1-ol (harmful and flammable) • Sodium bromide • Concentrated sulphuric acid (very corrosive) • Anhydrous sodium sulphate • Concentrated hydrochloric acid (corrosive) • Ethanol
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with Copper 2 sulfate producing copper and zinc sulfate. How would I solve for delta H? In the second experiment we are trying to determine delta H for the hydration of anhydrous copper 2 sulfate. If anhydrous copper 2 sulfate powder is left in the atmosphere slowly absorbs water vapour giving the hydrate solid. The enthalpy change will need to be determined when 0.025 mol of anhydrous copper sulfate is dissolved in 50mL of water. The enthalpy change of the hydrated copper sulfate when dissolved
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A The % Composition and Empirical Formula of a Hydrate: It Doesn’t Hold Water‚ Or Does It? 1. To determine the percent water in an unknown hydrate. 2. To calculate water(s) of crystallization for an unknown hydrate. 3. To determine the formula of an unknown hydrate. OBJECTIVES SKILLS Proper use of the following equipment: Dial-O-Gram balance (Laboratory Technique I)‚ electronic balance (Laboratory Technique II) and Bunsen burner (Laboratory Technique III). Dial-O-Gram balance‚ electronic
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