________ ______ This lab was basically about finding the percentage of acetylsalicylic acid in an aspirin tablet. First‚ the base was created‚ which was made out of 1.00 g of NaOH and D-water. Then the buret was attached to the clamp on the ring stand and the base was poured into the buret. After that‚ one by one‚ an aspirin tablet was dropped into an Erlenmeyer flask filled with 50 mL of D-water so that it could become dissolved. After the tablet was completely dissolved‚ a few drops of phenol
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Introduction Objectives Validate the Beer-Lambert law for KMnO4. To determine the pKa for an acid-base indicator To estimate the equilibrium constant for the formation of complex ion Fe(NSC)²ꭞ The function of part two of the experiment is to find the value of the constant K‚ in the following equilibrium constant: K=[Fe (NSC) ²⁺]/ [Feᶟ⁺] [NCS⁻]‚ while not disrupting the equilibrium. Theory For part one. The majority of chemical compounds are known to absorb UV or visible light. Depending
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Use data obtained after the addition of 10 mL 0.1 M KCl. (Be sure to use the exact titrator reading for the 10 mL addition.) Slope‚ intercept‚ and the equation for the calibration line. (Be sure to use the actual variables‚ not y and x‚ in the equation.) The equation for the line must be calculated by the Linear Least Squares (LLS) method (Appendix V). All work for the LLS calculation must be shown in a separate table in
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to get the moles of solution 1. Once the moles of solution 1 have been found‚ divide that by the liters of water that were added to solution 1. The 0.10000 L comes from the 100 mL volumetric flask the solution was made in. mL of stock solution x (moles of stock solution / liter) / total liters of solution 1 (volumetric flask) = M of solution 1 5.00 mL stock solution x (0.00721 moles / 1000mL ) /
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of string‚ flame source‚ rubbing alcohol‚ tap water‚ distilled water‚ paper‚ colored liquid drink‚ 100mL glass beaker‚ burner-fuel‚ burner-stand‚ 25 mL cylinder‚ 25mL volumetric flask‚ 2mL pipet‚ rubber bulb‚ goggles‚ 500g digital scale‚ test tube measuring 13x100mm‚ thermometer‚ small bolt‚ magnet bar‚ and an empty short stem pipet. To start off this lab assignment I measured the length of three objects in centimeters and millimeters with a metric ruler. I measured a knife‚ lighter‚ and a standard
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(AgNO3) * Analytical Balance * 2- Volumetric Flasks; one 50 mL flask‚ and one 100 mL flask * 2- Scoopulas * 10- Weigh Boats * 5- Filter paper * 5- 250 mL beakers * 2- 25 mL pipets * Distilled water * 2- 100 mL Erlenmeyer flasks * 2- glass funnels Procedure: 1. To the best of your ability‚ weigh out 3.75 grams of BaCl2 and 6.125 grams of AgNO3 on separate weigh boats 2. Pour the BaCl2 into the 50 mL volumetric flask from the weigh boat 3. Then add
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hydroxide |24-well reaction plate |toothpicks | |phenolphthalein test paper |small beakers |white paper | |vinegar |graduated pipet | | |distilled water |10. 0 mL graduated cylinder
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the previously standardized NaOH solution from #1 above. If 32.55 mL of NaOH titrant is required to reach the endpoint‚ what is the exact molarity of the HCl solution? 3. How accurately can you estimate the buret reading on a 50-mL buret that has calibration markings every 0.1mL? (Circle the correct answer) a) 1 mL b) 0.1 mL c) 0.01 mL d) 0.001 mL 4. Why should the sample size be such that not more than 50 mL of titrant is required to reach the endpoint? 5
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Vitamin C Content of Apple Juice Introduction Complete lack of ascorbic acid (a.k.a Vitamin C) in the diets of humans and other primates leads to a classic nutritional disease‚ scurvy. This disease was widespread in Europe during the fifteenth and sixteenth centuries‚ but it is rare today. Ascorbic acid is widely distributed in nature‚ but it occurs in extremely high concentrations in citrus and green plants such as green peppers and spinach. Ascorbic acid can be synthesized
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‚ K = (2 [B4O5(OH)42-] )2 * [B4O5(OH)42-] ) we get: K = 4 [B4O5(OH)42-]3 . Finding the concentration of borate ion in any sample at any given temperature gives us the solubility product at that temperature. Equipment: * 5mL pipet * Test tubes * Marker * Hot plate * 250 mL beaker * Flask * Electric balance
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