complete‚ sulphuric acid will be added to the refluxed solution‚ which will cause the salicylic acid to precipitate. This will then be filtered through suction filtration. Once the product has dried‚ purification must be done by recrystallization; dissolving the product in a minimum amount of hot solvent (water)‚ and then filtering once again through suction filtration. Finally‚ to complete the main purpose of the experiment‚ which is to compare the prepared product with a standard (salicylic acid from
Premium Salicylic acid Distillation Chemistry
Knowledge specification DN22 1) SKULL. The skull consists of 28 bones‚ 22 of which form the framework of the head and provide protection for the brain‚ eyes‚ and ears; six are ear bones. With the exception of the lower jaw bone and the ear bones‚ all skull bones are joined together and fixed in one position. The seams where they join are known as sutures. The bones of the skull are classified as either cranial or facial bones. Cranial Bones. The cranium is formed by eight major
Premium Skull Brain Bone
Consumer Product Safety Alert FROM THE U.S. CONSUMER PRODUCT SAFETY COMMISSION‚ WASHINGTON‚ D.C. 20207 Swimming Pool Safety Alert Each year‚ about 260 children under 5 drown in swimming pools. In addition‚ the suction from drains in swimming pools and spas‚ under certain conditions‚ can entrap swimmers underwater. To help protect your family‚ be sure to take the following steps. Use Layers of Protection To prevent swimming pool drownings‚ layers of protection are essential. Place barriers
Premium Drowning Swimming pool Consumer Product Safety Commission
others feel as if they did the right thing. There are many different ways to abort a baby‚ menstrual extraction‚ suction‚ D&C‚ D&E‚ hysterotomy‚ salt poisoning‚ etc. During the suction abortion the abortionist first paralyzes the cervix. A hollow plastic tube with a knife-like tip is then inserted into the uterus. The tube is connected to a powerful pump with a suction force 29 times more powerful than a home vacuum cleaner. During the procedure the baby’s body is torn into pieces and
Free Pregnancy Abortion Fetus
both the overhead and pneumatic tank systems. In general water supply systems where the pump takes off directly from the city pressure main or where no suction lift is required‚ a centrifugal pump can be used. When a centrifugal pump is being used with a suction lift of no more than 15 feet is required‚ a pump with an automatic primer or a suction line equipped with a foot valve may be used. To provide booster service. In booster service‚ centrifugal pumps with in-take pressures from the city main
Premium Electricity generation Nuclear power Hydroelectricity
the evaporator Coefficient of Performance is given by; Some factors that affect the Coefficient of Performance of the refrigeration are; Sub Cooling of liquids Superheating of Vapor (May be constant‚ increase or decrease) Change in suction pressure Change in discharge pressure Effect of volumetric efficiency of Compressor [2]. Methodology: Firstly‚ the mass flow rate of the refrigeration cycle was determined in order to get steady values of results. Secondly‚ the values
Premium Thermodynamics
She has a nasogastric (NG) tube to low continuous suction. She has an IV of 0.9% NS at 83 mL/hr. Current medications include furosemide 20 mg daily and hydromorphone 0.2 mg every 4 hours‚ as needed for pain. The morning electrolytes reveal serum potassium of 3.2 mEq/L. (Learning Objective 4) a. What are possible causes of a low potassium level? a. The possible causes of the low potassium may be related to the fact that she is NPO‚ the suction may be another cause‚ in addition to the furosemide
Premium Arterial blood gas Blood Electrolyte
causes a chemical reaction that turns salicylic acid’s hydroxyl group into an acetyl group‚ (R—OH → R—OCOCH3). An inorganic acid such as phosphoric acid is used as a catalyst. Set-ups Figure 1.1. Steam bath Figure 1.2. Cold bath Figure 1.3. Suction filtration set-up Figure 1.4. Melting point apparatus List of Necessary Chemicals Name and Structure of the Compound Function in the Exercise Physical Properties Hazards Precautions Salicylic acid C7H6O3 Ultrasal-ER is flammable. Keep
Premium Aspirin Salicylic acid Acetic acid
at high temperature & low at room temperature. If possible‚ the impurities should be insoluble in the solvent. 2.> How were soluble impurities removed from the derivative? [ANS] By soaking the impure derivative in 1 cm3 of methanol and resume suction. Repeat this for about 2 times. 3.> In the recrystallization procedure‚ why were the crystals dissolved in only the minimum amount of
Premium Chemistry Oxygen Temperature
Cecil hills high school Engineering Studies Lifting Devices MARTIN.MAROKI Abstract Part A Examination of current lifting devices (40 marks) You are to prepare a report comparing two lifting devices used to raise motor vehicles. Compare and contrast the two devices‚ explain their advantages and disadvantages. Your report will include; • a photograph and sketch of each lifting device and the lifting capacity‚ • a comparison on the 2 different methods of application‚ • a table
Premium Hydraulics Automobile Mechanical engineering