that our data in the experiment was “good data”. We had the expected positive results occur from the identification experiments. We made sure to measure everything correctly. We correctly identified the precipitate Zn(OH)2 by performing the acid and base test on our precipitate. We received a positive result for each test performed for the presence of the zinc hydroxide compound. It was interesting to note the appearance of the zinc hydroxide from only the mixture of zinc‚ iodine and deionized water
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10th & 17th Introduction： The purpose of this lab is to observe the titration between acid and base‚ and calculate the morality of unknown solution base on the volume required to reach equivalence point and stoicheiometry. There are two groups of experiments. The first one is the reaction between nitric acid and sodium hydroxide which is a reaction between strong acid and strong base‚ so‚ theoretically‚ the pH value of the the mixture of these two solution at the equivalence point in the
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Mg(OH)2 and swirled by hand This was continued until it turned from pink in colour back to a colourless solution The amount of HCL was then recorded in a data table This titration was carried out four times‚ the first being use for a base line Theory Hydrochloric Acid | + | Magnesium | | Magnesium Chloride | + | water | 2HCl (aq) + Mg(OH)2 (aq) ⇒ MgCl (aq) + 2H2O (l) Neutralization Reaction Hydrochloric acid reacts with Mg(OH)2 the products
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1%) concentration which permits detection of the utilization of this substrate only. The acid base indicator phenol red- also incorporated to detect carbohydrate fermentation that is indicated by a change in color of the medium from orange-red to yellow in the presence of acids. a. Method to inoculate slant: stab and streak procedure which requires insertion of sterile straight needle from the base of the slant into the butt. Upon withdrawal‚ the slanted surface of the medium is streaked. Determining
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being used increasingly as resolving bases for racemization since phenylethylamine is synthesizable and can readily be resolved into its antipodes. In contrast to naturally occurring alkaloids theoptically active forms of 1-phenylethylamine can be provided in any desired amount for technical purposes. In the racemization of synthetically prepared resolving bases‚ two antipodes are necessarily produced in equal amounts. However‚ it is largely only one resolving base that is needed for the racemization
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Figure 1: Titration curve of 0.160 grams of an unknown diprotic acid that was dissociated in distilled water. Shown is the pH versus the volume in milliliters of 0.1 M NaOH‚ a strong base‚ added to the solution. The initial pH reading of the solution was a pH of 2.60. Although the pH of the ½ equivalence point was unknown‚ it could be estimated by halving the volume of NaOH used at the first equivalence point. At the first equivalence point‚ 13.63 milliliters of NaOH had been added to the unknown
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sodium hydroxide solution‚ NaOH Actual concentration of sodium hydroxide solution used can be calculated by using the formula : MaVa = A MbVb B Where : M = Molarity; V = volume; a=acid; b = base; A = Number of moles of acid B = Number of moles of base Balanced chemical equation C8H5KO4(aq) + NaOH (aq) C8H4KO4Na (aq) + H2O From equation‚ 1 mol of C8H5KO4 react with 1 mol of NaOH 1.When Ma = 0.5 mol/dm³‚ ((0.5 mol/dm³) ( 0.023 dm³ ))/(Mb ( 0.066 dm^3))= 1/1
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Discussion of Theory: The lab as able to determine the concentration of NaOH by neutralizing the solution with HCl‚ a solution which its concentration was already known‚ this process is called titration. It works by neutralizing a solution from a weak acid/base and its
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testing one homogenate. The homogenate tested by our group was liquid spinach. Each team added HCl and NaOH to their homogenate. As we found out in our experiment‚ HCl was an acid so when added to the liquid spinach the pH lowered and NaOH‚ being a base‚ rose the pH level when added. The better the buffer the homogenate is‚ the less its pH changes
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iscussion The results and calculations shows that 1 tablet of Quick-eze is most effective in neutralizing the stomach because the number of moles of HCl reacted with the NaOH is 0.00216 moles‚ which is less than Gaviscon. The number of moles of NaOH that were added from the burette is 0.00327 moles (1 tablet of Gaviscon). However‚ for Quick-eze‚ the number of moles is 0.00216 moles (1 tablet). This means the average volume of the NaOH have affected the number of moles as the concentration of the
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