Also white & dark backgrounds are alternatively placed underneath the well plate for observing the mixture. Then the information is recorded into data book. Data Table 1: Reactions Expected Well # Chemicals Reaction A1 NaHCO3 and HCI - C02 Clear bubbles/bleach smell formed. No color change. A2 HCI and BTB Turned to amber orange A3 NH3 and BTB Turned to dark blue A4 HCI and blue dye Turned to green A5 Blue dye and NaOCI Color stays blue and not change until 1 drop of HCl added then color turned to light yellow A6 NaOCI and KI Turned from dark yellow to light yellow.
Do not open lid too far. 9.Obtain a 10-mL transfer pipet and a 50-mL buret. 10.Next obtain the 2g of baking soda and place in a beaker. The Na2CO3 solution must be kept in a clean and dry Erlenmeyer flask that is closed because solution will react with water. Doing the Titration 1.Mix 2g of
You can think of an Alka-Seltzer tablet as compressed baking powder with a little aspirin mixed in. Materials: |3 Clear glasses |6 Alka-Seltzer tablets |Mortar and pestle | |Stopwatch | | | Hypothesis: I think _____________________________________________________ Because______________________________________________________ Identify the variables:
Materials Materials From: Label or Box/ Bag: Qty Item Description Student Provided 1 Matches 1 Toothpicks (or wooden splints) 1 Pie tin or similar 1 Marker pen 1 Household white vinegar 1 3% Hydrogen peroxide (H2O2) 1 Measuring spoons 1 Drinking straw 1 Tissue paper 1 Baking soda (sodium bicarbonate) From LabPaq 1 Goggles-Safety 1 Test Tube(5), 13 x 100 mm in Bubble Bag 1 Well-Plate-24 Auxiliary Supplies Bag Auxiliary Supplies Bag- CK1 1 Gas Assembly; copper/plastic tubing in #00 stopper 1 Pipet, Empty Short Stem 1 Rubber stopper, #00, 1 hole, Pipet tip w/plastic gas delivery tube Experiment Bag Properties of Gases 2 Alka Seltzer® (1/4 tablet) in Bag 2" x 3" 1 Bromthymol Blue, 0.04% - 4 mL in Pipet 1 Hydrochloric Acid, 2 M - 20 mL in Dropper Bottle 1 Limewater (Calcium Hydroxide, Saturated) - 6 mL in Pipet 1 Manganese Metal Pieces - 4-6 Pieces in Bag 2" x 3" 3 Pipet Bulbs, Wide-Neck with 1/4" Stem 1 Zinc, Mossy - 4-6 Pieces in Bag 2" x 3" Note: The packaging and/or materials in this LabPaq may differ slightly from that which is listed above. For an exact listing of materials, refer to the Contents List form included in the LabPaq. www.LabPaq.com 57 ©Hands-On Labs, Inc. Experiment Properties of Gases Discussion and Review Several gases are produced frequently in the laboratory and it is important to be able to identify them by their physical and chemical properties. The gases under investigation are hydrogen (H2), oxygen (O2), and carbon dioxide (CO2).
With iodine it changes to a brown color and becomes clumpy. Using the mystery powder key, experimental results were compared to know results of baking soda,baking powder,cornstarch and powdered sugar. Chemical changes were made when a substance fizzes up or changes color. When a substance fizzed up into bubbles, it indicated a reactivity of solubility and a chemical change. Physical changes were indicated when a substance only reacted once.
Experiment 6: Physical & Chemical Properties Title and Identifiers: Heating of chemical properties 01/23/15 Purpose / Objective: • To investigate the chemical properties of pure chemical substances • To investigate the physical properties of pure chemical substances Procedural Outline: • Matches • Beaker, 100 mL, glass • Burner-fuel • Goggles-Safety • Stirring rod - Glass • Test Tube(5), 13 x 100 mm in Bubble Bag • Test-tube-clamp-holder • Test-tube-cleaning-brush • Well-Plate-24 • Well-Plate-96 • Litmus Paper, Blue • Litmus paper, Red • Copper (II) Carbonate in Vial, 1/2 Full • Copper (II) Nitrate Crystals in Vial • Copper Metal
1) Brine is salt water composed of potassium chloride, sodium chloride, lithium chloride, and calcium chloride. Contaminates such as KCl, LiCl, and CaCl2 may be present in the left over after the baking soda product goes through the process of filtration. In order to analyze their products for purity, value of craftsmanship, fundamental flaws, arrangement, and endurance, most manufacturing companies employ quality control scientists and technicians. Quality control resides in periodic examinations made to uphold quality during the manufacturing process. The Athenium Baking Soda Company is looking to employ a team of four quality control scientists to examine and determine their baking soda for pureness and quality.
1) In addition to sodium chloride, brine often contains potassium chloride, lithium chloride, and calcium chloride (i.e., KCl, LiCl, and CaCl2, respectively). Consequently, these compounds may be present in (and thus contaminate) the desired solid product – i.e., baking soda (NaHCO3) – when it is dried and filtered. In order to determine the composition and purity of the baking soda produced by ABSC, Team AMEE will utilize the following experimental techniques. First, using thermal gravimetric analysis, Team AMEE will determine the percent by mass of sodium bicarbonate in a
Methods My group used the method of titration to test whether the Vitamin C and lime juice nutritional facts where correct from their manufacture. First, we started with the standardized solutions, NaOh and HCl, to get familiar with how titrations work and start the titration of potassium hydrogen phthalate (KHP). We begun by gathering up all the necessary materials needed for the titration including: the general laboratory glassware from the bins, standard safety equipment, 50mL burette, phenolphthalein, NaOh (3 mol/L), HCl (3mol/L), KHP, ascorbic acid, and lime juice. The standardization of NaOh came first, which started by gathering the KHP and putting 1.5 g into 3 flasks with 50 mL of water in each. After we added the KHP to the 50 mL of water, we placed each one of the flasks onto a stir plate with a magnet in each flask so we achieved maximum stirring.
Chemistry 11 | The Decomposition Reaction of Baking Soda, NaHCO3 | Oscar ShiPeriod 2Laboratory AssignmentDue Date: 2011/4/14 | Introduction The objective of this experiment is to find the actual chemical equation that governs the manner in which baking soda (sodium hydrogen carbonate NaHCO3) decomposes. When NaHCO3 is heated, it decomposes to produce a gas and leaves behind a solid. Two possible equations for the decomposition are: NaHCO3 (s) + heat NaOH (s) + CO2 (g) NaHCO3 (s) + heat ½ Na2OH3 (s) + ½ H2O (g) + ½ CO2 (g) Materials and Methods * electronic balance * sodium hydrogen carbonate * ring * ring stand * crucible tongs * crucible * crucible lid * clay triangles The Procedure of the Laboratory 1. Put on safety goggles and a lab apron. 2.