Lab chemisty 03/27/2011 Five unlabeled bottles Set 1: A) colorless B) colorless C) blue D) blue E) colorless A: Ba(NO3)2 B: AgNO3 C: CuSO4 D) CuCl2 E) KCl Description how to identify solution: _ We have two blue solution which are CuSO4 and CuCl2 or C and D‚ according to chemical reaction experiment‚ C didn’t have any reaction with other solution like B and D beside A‚ so if we look at the solubility
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EXPERIMENT NO. 12 DIGESTION IN THE STOMACH ABSTRACT____________________________________________________________________________ Digestion refers to the mechanical and chemical breakdown of food into smaller components that can undergo absorption. The objective of this experiment is to investigate mainly the process of digestion in the stomach. The conditions at which the enzymes responsible for the digestion process were determined. Also‚ the total and free acidity of gastric juice of the sample
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solutions and Standardizing Acid and Base solutions Objectives: The objective of this experiment is: 1- To prepare two primary standard solutions‚ KHP and Na2CO3 2- To standardize a sodium hydroxide solution using the prepared primary standard KHP. 3- To standardize a hydrochloric acid solution using the prepared primary standard Na2CO3. 4- To calculate the concentration of an unknown acid or base. Introduction A primary standard is a standard that is accurate enough that it is not calibrated
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April 7th‚ 2015 Section- 109 Investigating Stoichiometry with Sodium Salts of Carbonic Acid Introduction- This experiment is intended to help find a better understanding of chemical stoichiometry through titrations of NaHCO3 and NA2CO3 with HCl. A chemical reaction is a process that involves rearrangement of the molecular or ionic structure of a substance‚ as opposed to a change in physical form in a nuclear reaction. Titration is when a measured amount of solution of unknown volume
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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which of the following statements about crystalline and amorphous solids is TRUE? A) An example of a crystalline solid is glass. B) An amorphous solid is composed of atoms or molecules with a majority of its volume empty. C) A crystalline solid is composed of atoms or molecules arranged with long-range repeating order. D) An example of an amorphous solid is table salt (NaCl). E) All of
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PREPARATION OF A STANDARD ACID SOLUTION NAME: ADDISON JOSHUA HUGHES ID: 1511907 EXPERIMENT: A.2.2.3.
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drop or two of the indicator. • Slowly add small amount of sodium carbonate until it changes color. • Measure out the initial and remaining mass of Na2CO3 of solution D. Data/Table HCI 0.5M Vol HC sol A Remaining mass of Na2CO3 HCI 0.25M Vol B Remaining Mass of Na2CO3 HCI 0.3M Vol C Remaining Mass of Na2CO3 HCI unknown Vol D Remaining Mass of Na2CO3 10 mL 0.28 g 10 mL 0.23 g 10 mL 0.21 g 25 mL 0.72g 15 mL 0.49 g 15 mL 0.42 g 15 mL 0.32 g 20 mL 0.60 g 20 mL 0.49 g 20 mL 0.46 g 30 mL 0.90 g 30
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more about the molarity of aqueous solutions‚ and how that quantity‚ along with the volume of the solution‚ can be manipulated to find the exact number of moles in a given volume. In this case‚ experimenters were given aqueous solutions of NaOH and CaCl2 in known molarities and then had them react with one another to yield a precipitate of Ca(OH)2. The precipitate was filtered out of the remaining aqueous solution of stoichiometry. In our case‚ all four tests yielded more mass than should have occurred
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CHM 3880 Fall 2011 Partner: Edwin Gay Abstract The PH at each point during the titration of sodium carbonate unknown sample was determined. An Unknown sample of Na2CO3 was titrated with a standard HCL solution. In addition to titration‚ the pH at each point of titration was measured using PH meter. The % of the unknown Na2CO3 was 25.83% Introduction1 The purpose of this experiment was to determine the actual pH at each point during the titration of a sodium carbonate unknown with the use
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In step1‚ one set up x as a mass of NaHCO3 in the original mixture. Thus‚ equation that shows that the total mass of NaHCO3 and Na2CO3 is 2.00g. In the second step‚ by using gravimetric analysis‚ one converts x into the mass of Na2CO3 that has been produced from heated NaHCO3‚ and states that the total mass of produced Na2CO3 and the Na2CO3 in the original mass is 1.605g‚ the result that the experimenter gained from the experiment. In the step4‚ one figures out the x‚ the mass of NaHCO3
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