eleven A Hard Time Literary Essay On The Story “Eleven” By Ivan Chen 4-209 A Hard Time Ivan Chen Class 4-209 “Eleven” was an interesting memoir written by the author Sandra Cisneros. It is basicially about Rachel (main character) when it was her eleventh birthday she didn’t even feel eleven. Sometimes she felt like 10‚ 9‚ 8‚ 7‚ 6‚ 5‚ 4‚ or even 3 years old. In school‚ she was told to keep a red sweater left over for months
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The objective of this lab is to determine the hardness of water‚ using the data collected from each titration performed with the unknown sample. Since the hardness of water arises from the presence of metal ions‚ we can use disodium salt of EDTA and the indicator Eriochrome Black T to determine the concentration of M 2+ ( Mg 2+ or Ca 2+) metal ion impurities. Chemical principle or theory involved in this lab: To determine waters hardness we will use a technique called a chelometric titration
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Title: Determination of Water Hardness Using a Titrator Purpose: To become familiar with the concept of water hardness‚ practice a titration technique using a titrator‚ and determine the hardness of the local water supply. Procedure: 1. Gather the test tube holder‚ small stopcock‚ 10-mL syringe (titrator)‚ and 2 thick textbooks and the LabPaq box or 5-6 thick textbooks. 2. Remove the plunger from the titrator and place it back in your LabPaq box. 3. Attach the stopcock to the tip of
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identification. EQUIPMENT Magnet Scales Caliper Periodic Table Rockwell Hardness Test Machine Fundamentals Of Materials Science for Technologists textbook PROCEDURE Use the following criteria to sort the samples and match them with the listed metals: Color Magnetism Weight/Volume Hardness Chemistry Analysis Experience DATA
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Bell type annealing furnaces for heat treating of cold rolled steel strip • Skin pass mills.CR Slitting lines and Cut to length lines. • Every process is closely monitored and end products are subjected to a battery of tests to determine Hardness‚ Tensile strength‚ Yield strength‚% of Elongation‚ cupping test and Bend test in order to meet stringent customer specification. • Finished products are carefully packed‚ using polythene and gunny for coils and poly craft and wooden/steel
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experiments with predetermined values of process parameters‚ the tensile strength is measured and the micro hardness is measured. The results are given in the table 3.5. Table: 3.5 Ultimate Tensile Strength and Micro hardness of SMAW & TIG for Experimentation Exp. No Groove Angle (Degree) Root Face (mm) Root Gap (mm) SMAW TIG UTS (MPa) Vickers Hardness (Hv0.1) UTS (MPa) Vickers Hardness (Hv0.1) 1 30 1 0 304 209 358 220 2 30 1.5 1 275 210 324 221 3 30 2 1.5 222 216 261 227 4 45 1 1 542 215 638
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Complexometric Determination of Water Hardness Kayla Partridge Britni Gonzales 09/15/2014 Abstract Determining the water hardness of unknown sample #55 was determined by complexometric titration. With the use of disodium salt EDTA as the solution to chelate the metal impurities and the Eriochrome Black T indicator as the solution used to help visualize when the impurities were completely chelated‚ along with a few other solutions to help the reaction. Unknown water sample #55 experimental
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CHM152LL LAB MANUAL COMPLEXOMETRIC DETERMINATION OF WATER HARDNESS Complexometric Determination of Water Hardness Introduction Complex ions When a neutral molecule or anion (a Lewis base) donates electron pairs and attaches itself to a metal ion center (a Lewis acid)‚ the resulting cluster‚ or complex‚ of atoms becomes a single complex ion. When such complexes form‚ the electron donating groups (called ligands) form coordinate covalent bonds through empty orbitals on the metal ion. An example
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Complexometric Determination of Water Hardness Abstract: Create a standardized EDTA solution for use as a titration solution to determine the hardness of water from a single random sample. Introduction: Using a calibrated EDTA solution to determine water hardness from a random sample. Essentially the Na2EDTA solution reacts one to one with the mineral content of a sample of tap water and by use of a standardized solution a ppm estimation can be obtained for the hardness of water. Current knowledge in
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soap and detergents. Calcium ions typically make the most significant contribution to water hardness. This is why hardness is measured in terms of mg CaCO3/L of solution. Hardness is also reported in units of parts per million (ppm). Water with a hardness value of < 60 ppm is considered “soft” and water with >200 ppm is considered “hard.” The purpose of this lab was to determine the water hardness of a sample of unk B tap water. The disodium salt of EDTA was used to determine the concentration
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