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Chemistry mass relationship.pdfStrategic Leaners: I am able to recognize and plan how to learn without wasting time by splitting up the work among my group members
Articulate Communicators: I am able to display my knowledge earned from the experiment in detail in a 27-page long lab report that I made with my group.
Mass Relationship Lab
Mass Relationship Lab
Reflection:
Reflection:
For this Mass Relationship lab, I got to learn about mass relationships by experimenting with the synthesis of copper (II) hydroxide Cu(OH)2. The chemical equation of the reaction is CuSO4 𑛀 5 H2O + 2NaOH → Cu(OH) + Na2SO4 + 5H2O. The experiment is executed with different concentrations of NaOH (Sodium hydroxide) as solution B and solution C with solution A being the copper (II) hydroxide Cu(OH). Solution A is a mixture of 2.5 grams of CuSO4 𑛀 5 H2O dissolved in 50 mL of water. Solution B is a mixture of 0.2 grams of NaOH dissolved in 25 mL of water. Solution C is a mixture of 0.6 grams of NaOH dissolved in 25 mL of water. Each of the solutions goes through a different method of filtration. Solution A + B goes through the suction filtration method but Solution A + C uses the gravitation filtration method. After filtering, both residues are placed in the oven at 50℃. The result from the reaction is then analyzed and observed. The product from the chemical reaction is then calculated for the percentage yield is then calculated to further understand this reaction. The yield percentage resulted in over 100% due to human error. In this work, I mainly helped work on the synthesis of solutions A and B as there was limited time and the work had to be split up for the group to work on. I enjoyed controlling the vacuum pump because the solution I worked on requires the vacuum suction filtration technique. From my experience, I discovered that if you put too much pressure, the rubber suction tube will end up deflating on itself leading to no air being sucked in to make a vacuum in the flat bottom flask.
Titration Lab
Titration Lab
Reflection:
Reflection:
For this titration lab, an experiment was done to find the unknown concentration of the analyte. The acid used in the experiment is Hydrochloric Acid (HCI) and the base used is Sodium Hydroxide (NaOH). These are very strong acids and bases and I am instructed to wear heavy protective gear in this experiment. The chemical equation of this is NaOH + HCL → NaCl + H2O. The concentration of HCI in the Erlenmeyer flask (hydrochloric acid) by slowly dropping NaOH from a burette (Sodium Hydroxide) according to the titration procedure. Three different indicators are used which are phenolphthalein, bromophenol, and universal indicator. First, for phenolphthalein, we add an average of 13.4 mL of base (NaOH) to the acid (HCI) until the solution turns from colorless to light pink. Second, for bromophenol, we add an average of 13.5 mL of base (NaOH) to the acid (HCI) till the solution turns from yellow to gray. Last but not least, for the universal indicator, we add 13.5 mL and 27 mL of base (NaOH) to the acid (HCI) until the solution turns green. The volume of NaOH is then calculated by using the final burette reading to the initial one. Apart from the mL of NaOH used, we also collected the volume and concentration of the acid in the flask (HCI) and the pH of the final solution by pH meter. We used the relationship between molarity, moles, and liters to calculate the concentration. This will give the concentration of the acid (HCI). The average HCl concentration results as an average of 0.054 M, 0.081 M, and 0.0536 M, for Bromophenol blue, universal indicator, and phenolphthalein, in that order. The pH is an average of 4.605, 6.82, and 8.15 in that order as well. However, the discrepancy between NaOH volume, HCl concentration, and pH in one of our universal indicator trials is an error because of human errors during data collection or unexpected contamination from our hands or the containers.
Titration Lab Report .pdfStrategic Leaners: I am able to recognize and plan how to carry out the multiple step procedures
Articulate Communicators: I am able to display my knowledge earned from the experiment in a 24-page lab report that I made with my group.
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