With the use of this technique we placed chlorine, bromine, and iodine into solutions containing chloride, bromide, and iodide. In the reaction the free halogen (X2) oxidizes the other halide ion (Y-) and gets reduced by gaining electron(s). In table 3, chlorine was the strongest oxidizing agent and iodine was the weakest oxidizing agent. Since chlorine was the strongest oxidizing agent it will react more and the weak agent will react less. This explanation can be demonstrated in table 3 also because the results of the reactions demonstrates that chloride reacted more by the color of the product compared to the color of chloride in the mineral oil.
C. Write a balanced equation for the neutralization of acetic acid with NaOH. HC2H302+NaOHNaC2H302+H20 D. How would your results have differed if the tip of the burette was not filled with sodiumhydroxide before the initial volume reading was recorded? It would have shown more NaOH then there actually was resulting in there
Both flask’s pH went up 4. Which substance, water or the buffer does a better job of maintaining pH when small amounts of strong base are added? Water does a better job at maintaining pH under these circumstances, but only slightly 5. Write equations for the reactions taking place in each of the flasks. For an equilibrium arrow ( ) is an equals sign (=) (Unless you know how to do equilibrium arrows).
The solution added reacted by turning the solution into a transparent liquid. This reaction is endothermic because the solution HC1 and Na2EDTA added decreased the reaction as the equilibriums both shifted to the left. When Na2SO4 was added the equilibrium should have shifted to the left. The solution reacted by creating more HSO4 even more when the 10 drops of the sodium sulfate solution was added as the color changed to a much lighter solution. When NaHSO4 was added the equilibrium should have shifted to the
Prelaboratory preparation: Read pages 1 – 30 and 45 – 54 of the lab text. You may disregard the microscale distillation procedures of TECH 0704. Answer in your laboratory notebook the Safety Quiz on pages 11 – 12 and the Prelab Questions 1, 2a, 2b, 3 -5, pp. 67 - 68. EXPERIMENT: TECH 0704, Distillation, macroscale technique only, simple and fractional: Substitute a mixture of 25 mL ethanol and 25 mL water for the toluene/cyclohexane mixture.
Next the freezing point which didn’t eliminate either of them. Next we look at the mass which was 7.465g/ml. This make me lean toward ethyl ether but the masses were still pretty close. Next we move to the solubility of the substances. They are both very soluble in alcohol and hexane so that doesn’t help, but in water ethyl ether is semi soluble and pentane is in soluble.
Unit 2 Assignment Angela Espinal Physician: Mr. Brown your lab results came back today. They are as follow * Triglycerides 145 mg/dl * Cholesterol 210 mg/dl * HDL 33 mg/dl * LDL 160mg/dl Brown: No offense Doctor, but I have no idea what any of those mean. Physician: That is alright Mr. Brown let me try to explain the results to where you can understand them. Triglycerides is a type of fat found in your blood. Your body uses them for energy.
The current causes the ions deposits into the tissues. As regarding diclofenac reducing pain the present study agreed with S. Hariharan et al(2006) iontophoresis increase the penetration of diclofenac into the tissues and increased analgesic effects. Another study Ross et al, said that NSAIDS medications can decrease nerve inflammation thus help in immediate pain reduction. One study R.N. Dermites who found that iontophoresis of diclofenac sodium is more effective to decrease pain than sodium salicylate on lateral
- signs of chemical change = changes the shape and color, creates a gas, distributes heat, Etc. - Chemical Change= Substance is formed into a completely new substance 2. Hypothesis: If the copper is being tested in these metals ( Copper, Magnesium and cupric chloride) then it would be the least reactive out of magnesium and zinc because it is the lowest among the three on the activity series. 3. Experimental Design: - Independent Variable: different types of metals: magnesium, zinc and Copper - Dependent Variable: amount of reactants observed for each metal - Control : The Air -Constants: The amount of chemical solutions, the time the metals were in the chemical solutions and size of each metal during the experiment 4.
(Make a rough titration first). 5. Calculate the moles and mass of acetylsalicylic acid in an aspirin tablet. Determine the mass percentage of acid in a tablet. Data collection VolumeV / cm3 | Titration trials | | | | 1 | 2 | 3 | 4 | 5 | Initial burette reading V / cm3±0.05 cm3 | 0.00 | 0.00 | 0.00 | 0.00 | 0.00 | Final burette reading V / cm3±0.05 cm3 | 13.6 | 13.9 | 14.0 | 13.9 | 14.1 | Total tire V / cm3 ±0.1 cm3 | 13.6 | 13.9 | 14.0 | 13.9 | 14.1 | Table 2 Volume of HNO3 required titrating NaOH in excess Mass of aspirin tablet ±0.001 [g] | 3.229 | 3.143 | 3.142