of HCl is titrated with a known volume of NaOH‚ then one can gather enough data to determine the concentration of the unknown which is HCl. Procedure Standardization of ~0.10M HCI 1- Weigh duplicate ~0.15 g samples of previously dried standard Na2CO3 Dissolve samples in ~100-ml distilled water; if it does not dissolve quickly‚ you may warm the solution. 2 - Cool the solution to room temperature and add ~ 0.5 to 1 ml of bromocresol green indicator‚solution turns into blue. Titrate it with HCl until
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it was for only 3 of the results shown above. The average titre is shown below: 16.60 + 16.60 + 16.30 = 49.50 / 3 = 16.5cm3 Going back to the beginning the equation for the reaction that is taking place is as follows: Na2CO3 (aq) + H2SO4 (aq)  Na2SO4 (aq) + CO2 (g) + H2O (l) Concentration of sodium carbonate solution In this experiment‚ a solution carbonate had to be made. This was done by mixing sodium carbonate with distilled water
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test tubes had just a little bit of liquid in them or were not completely cleaned out‚ the data could be affected. I think we made at least one mistake in our data. I think we made a mistake because when I calculated the moles for the NaOH and CaCl2‚ we got the same amount of moles for both solutions. That means that from the moles‚ there was no limiting reactant in test tube 3. From this lab‚ I learned how to calculate and find the limiting reactant. I also learned how to use stoichiometry
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Flame Tests The flame testing is a method used in chemistry to detect the presence of certain ions‚ primarily metal ions‚ based on each element’s characteristics emission spectrum. The colour of the flames normally depends on the temperature. Different types of Bunsen burner with flame types depend on the oxygen supply. The flame of rich fuel with no premixed oxygen produces a yellow diffusion flame. The flame of lean fully oxygen premixed flame produces no soot and the flame colour is produced
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Purpose: To observe the reactions of specific aqueous solutions with specific aqueous reagents. Introduction: A solution is as a homogeneous mixture containing two or more substances. Reagents are added to solutions to create a chemical reaction or added to see if anything occurs. Reagents can be added to solutions to see if there is a presence of other substances. For example‚ iodine added to a lead solution. Iodine would be the reagent and would cause a chemical reaction confirming the presence
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mud 2 (water+ bentonite + barite)‚ mud 3(water+ bentonite + barite + polymer)‚ mud 4 (water + bentonite + barite + polymer + CaCl2) in order to compare the rheological properties of each. It was observed that the density of mud 2 increased due to the adding of barite and there was an increase in the density of the muds‚ because of the adding of bentonite‚ polymer and CaCl2. All the mud behave as a Bingham plastic fluid. To conclude‚ with was observed that the components used to develop a mud define
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Making Molar Solutions and Dilutions Objectives: After performing this lab‚ the student should be able to: • Calculate grams of solute and correctly prepare a molar solution. • Prepare parallel and serial dilutions using C1V1 = C2V2 • Distinguish a parallel dilution from a serial dilution. • Determine whether a parallel or serial dilution should be used in a given situation. • Use a microcentrifuge to make a pellet. Making Molar Solutions and Dilutions A major job of any biotechnician
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Anionic | NaCl | Green | 8 | Neither | (NH4)Cl | Green- yellow | 7 | Neither | (NH4)2SO4 | Green- Yellow | 7 | Neither | AlCl3 | Red-orange | 3 | Cationic | Ca(NO3)2 | Murky green | 7 | Neither | Fe2(SO4)3 | Red | 2.5 | Cationic | Na2CO3 | Dark blue | 9.5 | Anionic | Na3PO4 | Orange-red | 3 | Cationic | K2SO4 | Green | 7 | Neither | KBr | Green | 8 | Anionic | (NH4)2C2O4 | Green | 8 | Anionic | NH4CH3COO | Blue green | 9 | Anionic | (NH4)2CO3 | Blue green | 9 | Anionic
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Water Treatment Water Demand • Various types of water demands for a city – Domestic water demands – Commercial & industrial demand – Fire demand – Demand for public uses – Compensate losses demand Water Demand • Domestic water demand – It depends on the habits‚ social status‚ climatic conditions and customs of the people. – The domestic consumption of water under normal conditions is considered to be about 135 LPCD (IS 1172-1971) – The details of domestic consumption per person
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Materials: 1. 37 o C water bath 2. Ice 3. Sterile transfer pipette 4. Foam tube rack 5. Transformation solution (CaCl2) 6. pGLO plasmid 7. Sterile Inoculating loop 8. 2 - LB+amp plate 9. LB+amp+ara plate 10. LB plate 11. LB broth 12. E.coli starter plate culture Procedure: The test tubes were labael +pGLO and another –pGLO‚ and placed them on a test tube. Transfer 250uL of transformation solution CaCl2 The tubes were place in an ice bath Transfer a colony of bacteria by using a sterile loop and mak e sure
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