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Chemistry Test Lab Report

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Part A: Effect of Concentration Gather materials. Prepare hot-water and ice-water baths, use 250 mL beakers and fill them halfway with tap water. Place one on a hot plate and heat to 65-70 degrees Celsius for use in Part B. In a second 250 mL beaker, add water and ice to make an ice-water bath for use in Part B. Add 3 drops of iron (III) nitrate solution to different spots in the Petri dish. Swirl the solution until the color is the same throughout the entire solution. Add ½ pea-size amount of potassium thiocyanate crystals in one spot, and wait 30 seconds while you record any changes in the solution. Swirl the solution to dissolve all of the crystals until the entire solution color is uniform. Add ½ pea-size amount of potassium nitrate …show more content…

Add 5 drops of 0.04% bromthymol blue. Swirl the solution. Add 2 mL of HCl and observe. Add 2 mL of NaOH and observe. Activity B. Formation of a Copper Complex Ion Measure about 5 mL of 0.2 M CuSO4 in a test tube. In a fume hood, add the concentrated ammonium hydroxide solution in drops instead of directly pouring it. Add HCl and observe. Activity C. Formation of Cobalt Complex Ion Label three test tubes A - C and place them in a test tube rack. Using a graduated beral-type pipet and add about 2 mL of the cobalt chloride solution to each test tube A - C. Make sure a pipet is used to measure so that all volumes are equal. Place A in an ice bath, B in boiling water, and C should remain a constant temperature. Add HCl to each and observe. Activity D. Solubility of Carbon Dioxide Obtain about 10 mL of fresh seltzer water in a 50 mL beaker. Add around 20 drops of 0.04% bromcresol green indicator. Swirl so that solution mixes. Draw up about 10 mL of the seltzer/ indicator solution into a 30 mL syringe. Seal the syringe by pushing a tip cap firmly onto its open end. When pressure increases or decreases a change in color may be observed. Activity E. Solubility of Magnesium

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