Jacob Hernandez October 23‚ 2014 Hima Lahari Marneni CHEM 1411. 114 Post Lab Report 6 Introduction The purpose of this lab is to determine the concentration of HCl when titrated with a standardized NaOH solution‚ through means of the titration method. My hypothesis is When an unknown concentration of HCl is titrated with a known volume of standardized NaOH solution‚ one can gather enough data to determine the concentration of the unknown (HCl). My prediction is If an unknown concentration of HCl
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Thermal Conductivity Heat can be transferred in three different ways: convection‚ radiation and conduction. Conduction is the way heat is transferred in a solid‚ and therefore is the way it is transferred in a heat sink. Conduction occurs when two objects with different temperatures come into contact with one another. At the point where the two objects meet‚ the faster moving molecules of the warmer object crash into the slower moving molecules of the cooler object. When this happens‚ the faster
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Digital PH Conductivity & Temperature Meter | 8000 | MT-106 | Digital PH Cum Temperature Meter | 5800 | ACS | PH Electrode | 1000 | ACS | Temp. Probe | 650 | ACS | Electrode Stand | 450 | | COLORIMETER | | MT-107 | Microprocessor Photo Colorimeter‚ 8 Filter | 9200 | MT-108 | Deluxe Photo Colorimeter‚8 Filter | 7500 | MT-109 | Digital Hemoglobin Meter | 7000 | MT-110 | Auto Photo Colorimeter | 7200 | MT-111 | Digital Photo Colorimeter | 6200 | | CONDUCTIVITY METER | |
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Introduction This experiment tests electrical conduction. Electrical conduction is the transportation of an electrical charge through a substance. This is done by the electrical charge/current being sent through the substance via electrons. These electrons carry the electrical current/charge throughout the substance’s length until another conductor is able to receive the electrons charge. Part B: Risk Assessment: During the construction of “the modified hurler‚ “
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Buffer Post Lab Calculation 1. We added too much NaOH to our buffer 1 solution. The original pH was 5.32‚ with 10mL of buffer and 10mL of DI water. We added 5mL of NaOH and the pH changed to 12.12. If 5 mL changed the pH by about 7‚ then we predict that about 2 mL of NaOH would change the pH by about 2. This prediction is based on the fact that 2.5mL is half of 5mL‚ and 3.5 is half of 7‚ so adding a little less than 2.5mL would give us a difference of about 2. For the buffer 2 solution‚ the original
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I. Title: Iron-Copper (II) Chloride Reaction II. Purpose: The purpose of this lab is to see how iron reacts with a copper (II) chloride solution. III. Equipment and Reagents Scoop copper (II) chloride (CuCl2) Beaker Iron (Fe) Wash Bottle water (H2O) Scale Hydrogen chloride (M HCl) Filter Paper IV. Procedure: 1. Obtain a clean‚ dry 250 mL beaker. 2. See teacher to obtain a scoop of CuCl2 in the beaker. 3. Add approximately 50 mL of tap water to
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such properties as electrical conductivity‚ lowering of the vapor pressure‚ refractive index‚ and sodium ion concentration remained identical in both the sol and the gel state. In support of their theory‚ Laing and McBain point out that Arrhenius (5) found the conductivity in gelatin-water-salt systems to be the same in both sol and gel. This aspect of the micellar theory has been extended by Gelfan (6) to protoplasm because he found that the conductivity of protoplasm remained independent
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Chem 31.1 Post Lab 3 CARBONYL COMPOUNDS AND CARBOHYDRATES HYDROLYSIS OF POLYSACCHARIDES - - Susceptible to both nucleophiles and electrophiles Presence of C=O TEST FOR ALDEHYDES AND KETONES - - Reaction with 2‚4-DNP (Dinitrophenylhydrazine) Positive: Formation of yellow precipitate IODOFORM TEST - Carbonyl compounds: Methyl ketones will give a positive result Postive: Yellow precipitate (CHI3) MOLISCH’S TEST for carbohydrates - TOLLEN’S TEST – for aldehydes
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4.1 & 4.2: General properties of aqueous solutions and Precipitation Reactions: 1. (Brown 4.11) When asked what causes electrolyte solutions to conduct electricity‚ a student responds that it is due to the movement of electrons through the solution. Is the student correct? If not‚ what is the correct response? 2. (Brown 4.15) Specify what ions are present in solution upon dissolving each of the following in water: a. ZnCl2 c. (NH4)2SO4 b. HNO3 d. Ca(OH)2 3. (Brown 4.16 ) Specify
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Density of Solutions Lab Purpose: The purpose of this lab was to find out the densities of the known and unknown Solutions that were given to us. This can be found by dividing the mass by the volume of the Solutions. The other purpose of this lab was to perfect our skills in finding out the percentage error‚ uncertainties‚ random error‚ and systematic error. Variables: Independent: Mass Percentage of Solution (KCl); Unknown Solution; Temperature Dependent: Density Materials: 10.00 mL
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