Ideally‚ the percent yield should be 100%‚ as this means that you have recovered 100% of that material. A yield over 100% would mean that the substance still has some traces of another material that is adding additional mass. Ex. The iron filings having some sand particles leftover. A yield under 100% would mean that some of the substance was not recovered‚ it could have been lost (spilled) or found in another substance (not separated completely). The percent yields may give some insight into what
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Vinegar Tom: More Than Just a History Play Oppression takes many forms in society; Capitalism over the working class‚ patriarchal communities over the women in them and in some cases even women over women. Caryl Churchill has explored such issues in her works mainly pertaining to the position of women in male-dominated societies. In fact‚ her works utilize various plot structures to harness support for the improvement of the position of women in society while some attempt to illustrate women’s
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water completely changes even if it goes up by .1 or .2 percent it’s still a lot and will affect all the life in the water. Our guiding question to the experiment was‚ what does different concentrations of acid do to the shell? I had hypothesized that when we increased the amount of acid in the water the mass of the shell would decrease.
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Assessment 2-Benzoic Acid Synthesis Synthesis and Investigation of Benzoic Acid Our aims: Create benzoic acid using benzaldehyde and hydrogen peroxide. Then remove some impurities from the benzoic acid crystals. Apparatus: Titration Pipette (25 cm3) Burette (50 cm3) Retort stand Clamp Conical flask (250 cm3) Volumetric flask (250 cm3) and stopper White tile Beakers (250 cm3) Dropping pipette Filter funnel Deionised water Phenolphthalein indicator Volumetric flask Melting point
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nitrogens on this station. Both of these methods rely on the repulsive electrostatic interactions between the positively charged axial component and the post-switching cationic nature of the benzidine station (Figure 5.4). Deuterated trifluoroacetic acid (d-TFA) was added in the solution which resulted in the protonation of the benzidine residue and shuttling of macrocycle in to the biphenol station of the Rotaxane. This was supported by NOESY 1H NMR that showed a shift in the peaks in retrospect to
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Producing Isoamyl Acetate from Isoamyl Alcohol and Acetic Anhydride through Esterification Racquel Erica D.G. Isada‚ Jannah B. Juan*‚ Moses Isaiah L. Koh and Hedder A. Lim Department of Biology‚ College of Science University of Santo Tomas‚ España Street‚ Manila 1051 Date Submitted: August 13‚ 2014 Abstract: In this experiment‚ the synthesis of Isoamyl acetate from Isoamyl alcohol and Acetic anhydride was prepared with the process of Esterification. By using the reflux technique‚ extraction
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To determine if the reaction had gone to completion‚ a Starch/Iodine test was conducted. A change in the strip to a deep blue color would signal an excess of sodium hypochlorite reagent present. An excess is the reagent symbolizes the end of the reaction because there is no longer any reactant left to consume reagent. After the reaction was deemed completed‚ the product was isolated and purified by ether extraction‚ aqueous extraction and evaporation. To determine how sodium hypochlorite acts as
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August 28‚ 2009 [PROBLEM SET FROM R. CHANG TEST BANK] Chapter 16 Acid-Base Equilibria and Solubility Equilibria Student: ___________________________________________________________________________ NOTE: A table of ionization constants and Ka’s is required to work some of the problems in this chapter. 1. In which one of the following solutions will acetic acid have the greatest percent ionization? A. B. C. D. 2. Which one of the following is a buffer solution? A. B. C. D. E. 3. 0.40 M HCN and
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EXPERIMENT 3: INTRODUCTION TO TITRATION – DETERMINATION OF THE MOLARITY AND CONCENTRATION OF SULPHURIC ACID BY TITRATION WITH A STANDARD SOLUTION OF SODIUM HYDROXIDE INTRODUCTION Reaction of acid and base is one of the most common reaction in chemistry. This reaction is also widely known as neutralization. In this experiment‚ we used titration technique which involves accurately measuring the volume of a solution required to react with another reagent. An indicator must be used to determine the
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Elizabeth Obuya MBA 651 HR Case Study: How about a 900 Percent raise? 1. Recruiting nurses abroad can be mutually beneficial or a disadvantage to both the U.S and the foreign country. Hiring ready to deploy and fully qualified nurses can help to temporarily bridge the nursing shortage until the government is assured the situation is in a better control. Also‚ according to Karen B. Haller‚ Vice President for Nursing and Patient Care Services at the Johns Hopkins Hospital‚ foreign recruitment creates
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