Gravimetric Analysis CHEM 200-03 Fall Semester 2012 September 19‚ 2012 Jeff Marasigan Abstract Gravimetric analysis is based on the quantitative isolation of the desired constituent the analyte of interest from the sample in highly pure form or in some combined form and weighing the isolated constituent. The desired constituent is usually isolated or separated by precipitation. From the weights of sample and precipitate‚ the percentage of the constituent in the original sample can
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Experiment: Preparation and Identification of Dibenzylidene Acetone Purpose: Prepare dibenzylidene acetone by the famous Claisen-Schmidt condensation reaction. Learn the experimental skills of organic synthesis‚ separation‚ purification‚ structural characterization by instrumental analysis. Train the ability to solve the practical problems. Principle: Aromatic aldehydes can have aldol reaction with aldehydes or ketones which have α-hydrogen atoms‚ dehydrate to form high yield of α‚β-unsaturated
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wheelie bin lifting mechanism allowing operators to switch between wheelie bins‚ which can then be collected by a refuse vehicle. 4. Hinge turning structure can make the turning radius much smaller and sweep the twisty and narrow place. 5. Suction system structure adopts circulation blow back combine with filter. High dust filtration rate of 98% makes the YHD21 suitable for use in public areas. it can sweep with or without water. 6. The drive mode adopts hydrostatic infinitely variable
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few different medical ways an abortion can be performed. These are relatively safe surgeries‚ considering of course the actual practice. One of the main surgical abortion procedures is known as aspiration. The procedure‚ also known as “suction aspiration‚ suction curettage or vacuum
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distilled water. An aspirator is assembled by using a suction flask‚ clamp‚ ring stand‚ rubber tubing‚ funnel‚ and filter paper to filter the reaction mixture once the first reaction is complete. The filter paper is then wetted‚ the vacuum source is turned on‚ and the mixture is poured through the filter‚ using 5 mL of distilled water to rinse the beaker. The filter will catch all the dark filtrate from the aluminum can pieces‚ and the suction flask will contain a clear (transparent) solution. The
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these tubes? Ans- Ideal ET Tube is south facing RAE (Ring Adair Elwin) tube fixed in center over the lower lip. RAE Endotracheal Tubes are designed to conveniently position the anesthesia circuit out of the surgical field. Problem- Difficult to pass Suction catheter. Fixed curvature hence more chances of endobronchial intubation or inadvertent extubation. Flexometallic tubes- Inner diameter of tube decreases so airway pressure increases. Permanent kinking of the rings due to retractor pressure leads
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Page 1 of 63 PIPING QUESTIONAIRE Questions related to Codes & standard: 1. What is the ASME code followed for design of piping systems in Process piping (Refineries & Chemical Industries)? (i) B 31.1 (ii) B 31.3 (iii) B 31.5 (iv) B 31.9 Answer (II) 2. Which American institute standard does piping engineer refer? Answer: A. B. C. D. E. F. G. The American Petroleum institute (API). The American Iron & Steel institute (AISI). The American Society for Testing and materials (ASTM). The American
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trained medical workers during the first trimester. There are four different techniques utilized during the first twelve weeks of pregnancy. Suction aspiration‚ also known as vacuum curettage‚ is the most common surgical means of abortion. This is when a powerful suction tube with a sharp cutting edge is inserted into the womb through the dilated cervix. The suction dismembers the body of the developing baby‚ tearing the placenta from the wall of the uterus‚ and sucking blood‚ amniotic fluids‚ placental
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the condenser. The mixture was heated under reflux for an additional 15 minutes after the foaming subsided. The mixture was then allowed to cool to room temperature and then put into an ice water bath. Afterwards‚ the crystals were collected via suction filtration and rinsed with three 5-mL portions of cold 95% ethanol to yield 2‚3‚4‚5-tetraphenylcyclopentadienone in an 81.2% yield as a dark purple crystalline solid: mp 218-220°C‚ (lit3 mp 217-220°C) Reaction Equation B:
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