for Exercise A: A. Use your results to determine if the forward reaction in the potassium chromate/HCl reaction endothermic or exothermic. Explain your answer‚ using Table 1 to help construct your thoughts. According to table‚ I would assume the reaction is exothermic. I would assume this because when the chromate/HCl were in warmer temperatures it was solid orange‚ then when adding the chromate/HCl in the ice bath it formed a precipitate. The precipitate forming shows that there is an addition of
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negatively charged conjugate base that became soluble in water. This interaction caused a separation of the mixture into an ether layer and a denser aqueous layer. The aqueous layer was extracted and transferred into two test tubes where HCl was added. HCl acted as a proton donor to the acid in the aqueous layer and caused the acid to precipitate out of solution. This was the reason for the white‚ cloudy precipitate substance that was observed in the test tube. The Litmus paper test further
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Experiment #1: Carbohydrate Digestion • Tube 1 Digestion Lab – 3 ml water • Tube 2 – 3 ml 0.2% amylase • Tube 3 – 3 ml 0.2% amylase + 10 drops of 1.0M HCl • Tube 4 1 2 4 3 – 3 ml 0.2% amylase – place in hot water bath for 5 min Experiment #1: Carbohydrate Digestion • Add 5.0 ml starch solution to each tube • Incubate in 37°C bath for 1.5 hr • Divide contents of each tube evenly into 2 tubes – Lugol’s Test – Benedict’s Test Experiment #1: Carbohydrate
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A digital scale‚ a centrifuge‚ two (2) test tubes‚ 4.0 mL of 5.0% NaHCO3‚ micropipette (glass with rubber suction top)‚ a stirring rod‚ and a vial. A 50 mL beaker‚ 2 x 1.0 mL of 6.0 M HCl‚ pH paper‚ a vacuum chamber‚ a test tube rack‚ scooper‚ ice bath‚ hot water bath‚ hot plate‚ Hirsche funnel‚ and a rubber tube are all necessary to perform the
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Experiment 5- Standardization of NaOH and determination of Molarity of an unknown Acid Objectives 1. Preparation and standardization of a 0.1M NaOH solution 2. To learn the technique of titration 3. Determination of the concentration of an unknown diprotic acid. Introduction Titration can be traced to the origins of volumetric analysis‚ which began in the late eighteenth century. Study of analytical chemistry began in France and the first burette was made by Francois Antoine Henri
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CHE 101 Experiment 1 Lab Techniques and Measurements Purpose: The purpose of this lab experiment is to review and learn the proper techniques for the measurement of length‚ mass and temperature. After this experiment I expect to have a better knowledge on how to correctly and efficiently measure for future lab experiments. Data: DATA TABLE #1 DATA TABLE#2- DATA TABLE#3- DATA TABLE #4 DATA TABLE #5 DATA TABLE #6
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materials: 0.20 M HCl solution‚ 0.20 M NaOH solution‚ 50 ml burette‚ bromophenol blue‚ 150 ml flask‚ electronic scale‚ tripod stand‚ motor and pestle‚ Bunsen burner‚ Tums tablet‚ Rolaid tablet‚ and Equate tablet. 2. Weigh antacid tablet as a whole on the electronic scale and record the data. 3. Break up the antacid tablet with the motor and pestle and weight it‚ ensure that it weighs between 0.80 and 1 gram and record the weight of the sample. 4. Add 50 ml of 0.20 M HCl solution to the
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LIMITING REAGENT Practice Problems 1. At high temperatures‚ sulfur combines with iron to form the brown-black iron (II) sulfide: Fe (s) + S (l) ( FeS (s) In one experiment‚ 7.62 g of Fe are allowed to react with 8.67 g of S. a. What is the limiting reagent‚ and what is the reactant in excess? b. Calculate the mass of FeS formed. 2. Arcylonitrile‚ C3H3N‚ is the starting material for the production of a kind of synthetic fiber acrylics) and can be made from
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solution was formed‚ and the precipitate was dissolved. But upon the addition of HCl‚ the color of the solution returned to pale blue again. This is because the addition of H+ reacts with NH3 and forms NH4+ . This causes the reactant-favored shift of equilibrium. (7) H+(aq) + NH3(aq) → NH4+ It was also noticed that it took more drops of NH3 turn the solution to deep blue complex than the number of drops of HCl needed to turn the solution back to pale blue. The Chromate - Dichromate equilibrium
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_____________________________________________________________________________________FACULTY OF APPLIED SCIENCE BACHELOR OF SCIENCE (HONS) BIOLOGY BIOLOGY DEPARTMENT BIO560 ASB3Cb EXPERIMENT 1: FUNDAMENTAL PHYSIOLOGICAL PRINCIPLES (ACID & BASES) STUDENT’S NAME MOHAMAD SYAMIL BIN MD. JANI 2013618492 LECTURER’S NAME: MDM DATE OF EXPERIMENT: 1 OCTOBER 2014 DATE OF SUBMIT: 8 OCTOBER 2013 INTRODUCTION: Physiology is a quantitative science that works on measuring changes
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