were used to determine the melting point. 6. The bicarbonate extract was acidified with concentrated HCl. A piece of litmus paper showed that it was acidic. 7. The benzoic acid was extracted by shaking it with25ml portions of dichloromethane. The organic extracts were collected in a pre-weighed Erlenmeyer flask and evaporated on the steam bath. The mass of Benzoic acid produced was determined. RESULTS (i) Naphthalene: 0.85g; Benzoic acid: 0.71g (ii) The melting point of Naphthalene: 80-89º
Free Liquid Water Sodium bicarbonate
the freezing point depression of a known amount in an aqueous solution. Freezing point depression is a colligative property of solutions. There are three other properties‚ which are boiling point elevation‚ vapor pressure depression‚ and osmotic pressure. Colligative properties of a solution depend on the amount of solute and solvent molecules and not the specific properties of the molecules. The temperature at which the solvent starts to freeze will be specified as the freezing point of the solution
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information about boiling water. If you cover the tin and allow the water and air to cool down‚ the air will cool and contract‚ lowering the pressure in the tin. If it lowers enough‚ the partial vacuum will collapse the walls of the can! The boiling point definitely reduces with air pressure. There is a famous demonstration where boiling water or coffee is drunk‚ the trick is it was in a vacuum chamber where it boiled at room temperature. The actual definition of the boiling point of water is the
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and Sciences Experiment #3 SEPARATION AND PURIFICATION OF ORGANIC COMPOUNDS: CRYSTALLIZATION Gomez‚ Paola Anne M. DOP: 2 July 2013 Student no. : 4120403 DOS: 9 July 2013 Group: Carcinogenic Remarks: _____________________________________________________________________ Engr. C. D. Sanchez Instructor THEORETICAL DISCUSSION Crystallization is a technique which chemists use to purify solid compounds. It is one of the fundamental procedures each chemist must master
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Contribution of Emile Durkheim (bullet points) Religion Durkheim believed that god concept is collective creation and power that is used by groups to direct the behaviour of its members. The basic principles of religion and rituals is to keep solidarity in the society especially in the periods of conflict. Function of religion is not to worship the god but the society. Within division of labour Durkheim made clear distinction between mechanical and organic solidarity. Mechanical solidarity
Free Sociology Émile Durkheim
AND PURIFICATION OF ORGANIC COMPOUNDS AIMS: To isolate organic‚ inorganic and component from a given sample. To become acquainted with various separation methods. To examine the solubility behavior of the various compounds in a mixture using different solvents. INTRODUCTION A commonly used method of separating a mixture of organic compounds is known as liquid-liquid extraction. Most reactions of organic compounds require extraction at
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The book Pivot Point is a book full of “what ifs”. In the beginning‚ Addie Coleman‚ the main character‚ gets home from a normal day of school. When Addie walked into the living room to tell her mom and dad how her day at school was‚ Addie noticed it was eccentric her parents were sitting on opposite sides of the couch. Waiting to find out why they’re not sitting next to each other‚ Addie’s mom amicably told her they are going to file for a divorce and she needs to decide which parent she wants to
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Freezing Point Depression Purpose: The purpose of this lab is to demonstrate freezing point depression by dissolving salt into two liquids and monitoring temperature. Materials: test tube‚ Thermometer‚ 10 mL graduated cylinder‚ 2 micropipettes‚ Styrofoam cups‚ 4 pieces plastic wrap‚ 70% ethyl rubbing alcohol‚ 91% isopropyl rubbing alcohol‚ ice‚ distilled water‚ rock salt Procedure: Using the graduated cylinder‚ measure 2 mL of alcohol and pour it into the test tube. Add 10 mL of
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From Famine to Five Point Five Points is‚ as the extended title boasts‚ "The 19th century New York neighborhood that invented tap dance‚ stole elections and became the world’s most notorious slum." Unlike most subtitles that promise all by the moon and the stars‚ all these statements and more are absolutely true. The Five Points neighborhood quite literally defines the term melting pot‚ a mixture of cultures‚ faiths and political ideologies that was at one time volatile but also a source of amazing
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Development Center September 1998 One of the most common tools used in evaluating the economic feasibility of a new enterprise or product is the break-even analysis. The break-even point is the point at which revenue is exactly equal to costs. At this point‚ no profit is made and no losses are incurred. The break-even point can be expressed in terms of unit sales or dollar sales. That is‚ the break-even units indicate the level of sales that are required to cover costs. Sales above that number result
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