alpl 5itr9 lvoodr‚arilc ard g1*r6 rqt4 rvticllr 4gtd ftr eshHahng tt6 Po$’t\oh of rnaxl 6q* qb$rbq\r. rraeg lOqgtr in ‚.1yq’iolef c1eetftrtstu^1’ lr"‚r." ‚ c k nov"q 49 wqtQlorl$’ftt q+ "/Irtgla rnq’xi tt"urn a|qo( bqwc.Q ;4 4- what type of organic compounds show UV absorption bands and why ? th‚ ‚{ orgq*C(ohtounAs’th4tOrotr‚ Uv atog0{tt0h bonds qt{t lnosb wrfi.‚ vi‚!h dQSroe .t (oT!ryrti oh and abcov b tigrat lu t{v 0v vtltblg re{io\ 0t tt .tror\qgnch6 ca{cfrnn && calvent $r lhosf detu
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In this lab‚ the pH of flat sprite and a fresh sprite are compared two ways: one way was to record the pH directly with a digital pH probe and the other was to calculate the concentration through titration. Because the reaction is a neutralization reaction‚ the concentration of can be calculated if the concentration of is known. At the end of the titration‚ the moles of will equal the moles of and the pH is expected to be greater than 7 because the found in sprite is weak and is a strong
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Chemistry design: Fuel energy lab Research question: What is the energy density of cyclohexane‚ and how does it compare to the energy density of normal hexane? Variables: Independent variable – The independent variable in this experiment will be the type of fuel that will be used. This will be either Hexane or Cyclohexane. Each type will be given to us and labelled so it will be quite simple to control this variable. This cannot be measured using any apparatus so the lab assistant must be entrusted
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Date: May 22‚ 2012 Name: Cristhian Valor Organic Laboratory Pre-Lab 1. Main reaction sequence including side reaction products: 2. 3 Sentence Summary of the Experiment: The OH group on the benzene ring in salicyclic acid reacts with acetic anhydride to form an ester functional group. Thus the formation of acetylsalicyclic acid (aspirin) is referred to as an esterification reaction‚ which requires the presence of H+ (H2SO4 in our case). The technique used to purify the aspirin content
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When it comes to organic chemistry and the synthesis of specific products there is an abundant amount of routes that can be taken and still get you the same result. For the following experiment‚ the main focus is the use of a cycloaddition reaction‚ also known as Diels-Alder. According to the lab manual‚ this reaction consists of the addition of a diene and a dienophile and that the Diels-Alder reaction builds stereospecific ring compounds with ease (Weldegirma 80). The reaction takes place between
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peak at δ 138.4; negative peaks at δ 30.2‚ 31.9‚ 61.8‚ 114.7 12. Refer to the mass spectrum of a hydrocarbon shown below to answer the following questions. (12 pts.) (a) What peak represents the molecular ion (M+)? (b) What peak represents the base peak? (c) Propose plausible molecular structures for the hydrocarbon. (d) Propose structures for the fragment ions at m/z = 57‚ 43‚ and 29 based on your answer (c). 13. Match a structure from the list below to the following
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IB1 Chemistry Practical #8 ANALYSIS OF ASPIRIN TABLETS For a long time the bark of the willow tree (salix alba) was used as a traditional medicine to relieve the fever symptoms of malaria. In the 1860’s chemists showed that the active ingredient in willow bark is salicylic acid (2-hydroxybenzoic acid) and by 1870 salicylic acid was in wide use as a pain killer (analgesic) and fever depressant (antipyretic). However‚ because it is a relatively strong acid‚ salicylic acid has the undesirable side effect
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Experiment #5: Acid Burn!!! Introduction The goal of this lab was to correctly prepare a 0.2M solution of NaOH‚ identify highly acidic household cleaning chemicals‚ and determine their concentration (molarity) through titrations using the previously prepared 0.2M NaOH solution. Experimental First‚ to create 0.5L of 0.2M solution of NaOH‚ standard 3M NaOH solution was obtained. Next‚ calculations were performed to determine the amount 3M NaOH necessary to create 0.5L of the 0.2M solution and‚ as
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Figure 2 Figure 3 Figure 1 show the crystallisation reaction when the saturated sodium chloride solution was added to the cool reaction mixture. The salt of p-Toluenesulphonic acid started forming. Figure 2 show the wet crystal after the precipitated salt was being filtered by suction. The wet crystal was light purple in colour. Figure 3 show the end product after drying the wet crystal at 105°C in the drying cabinet (oven)
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almost everyone associates with acids and bases is the litmus paper‚ which has the ability to change the color in response to an acid or a base. Phenolphthalein is another common indicator use by beginners in chemistry because its color change is very obvious‚ making it easy to use. There are many other indicators that change color at different pH levels‚ and so are useful for different purposes. Many pigments found in nature can be quite effectively used as acid-base indicators. The purple eggplant
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