Lacy Taylor iLab‚ Week #5 UNKNOWN ACID AND BASE TITRATION Introduction The pH‚ or the concentration of the hydrogen plus ion [H+]‚ is one of the most critical parameters in predicting if a system will corrode‚ or determining why a system is corroding. PH is defined as the negative log base 10 of the hydrogen plus ion concentration in the units of moles per litre. Procedure pH MEASUREMENT OF UNKNOWN SOLUTIONS Obtain the following apparatus from the equipment menu: 100 mL beaker
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of the catalase was not changed or changed slightly oxygen was produced. Our data suggests that catalase solution that is not changed a lot by an acid and base is the most effective in enzyme activity. However‚ when the pH of the solution was altered by 3-5 levels of pH there was no enzyme activity. The control catalase without any acid or base added to it at a pH of 6 produced 8-12 ml of oxygen every 5 seconds for thirty seconds (Figure 5). However for trials 2 and 4‚ they were similar because the
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Introduction In quantitative chemical analysis‚ acid - base reactions are often used to provide a basis for various titration techniques. The equivalence points of acid - base titrations can be estimated from the colour change of chemical indicators‚ such as phenolphthalein‚ methyl red‚ methyl orange and so on. The choice of an indicator suitable for a particular titration requires a detailed knowledge of the chemical properties of the acid and base. This difficulty can be avoided by using physical methods
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any left over acid or base down the sink with lots of water. Remember‚ acids and bases will neutralize each other when mixed. Data and Results *Normality of vinegar (Na) = (Nb)(dropsb) / (dropsa) (.5)(22) / (10) = 1.1 N *Mass of Acetic Acid = (Na)(GMMa) (1.1)(60) = 66 g *% of Acetic Acid = Massa (g/L) / 1000 g/L x 100% 66 / 1000 x 100 = 6.6 g/L Balanced equation: HC2H3O2 + NaOH ——> NaC2H2O2 +
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Chapter 10 Practice Test: 1) How do you make a proton out of a hydrogen atom? E) remove an electron from a hydrogen atom 2) What is an acid? E) anything that donates hydrogen ions 3) What is a base? D) anything that accepts a hydrogen ion 4) What best describes what happens when an acid such as HCl is mixed with water? B) The proton chemically bonded to the chlorine is transferred to a water molecule and forms a chloride ion and a hydronium ion. 5) According to the following reaction‚ which
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Menbere Wendimu Che101 Laboratory Report Acid Base Laboratory Objective: Introduction: Experimental: 2.04 g of KHP‚ 100ml volumetric flask‚ distilled H2O‚ approximately 0.1 M of NaOH‚ Vinegar‚ Phenolphthalein‚ 250ml Erlenmeyer flask‚ weighing balance‚ Graduating Cylinder‚ burette and pH meter were used in our experiment. In our first part of our experiment to prepare a primary standard‚ 0.1 M solution of KHP‚ we carefully weighed out 2.04g of KHP in a weigh paper using the weighing balance
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Hydrochloric Acid 0.5M HClStrong Base 0.85 0.90 4 Jonah Nitric Acid 0.1M HNO3 Strong Acid 2.14 2.14 5 Sodium Acetate 1M NaC2H3O2 Weak Base 9.42 9.42 6 Potassium Dihydrogen Phosphate 0.1M KH2PO4 Weak Acid 5.47 5.47 7 Andy Potassium Hydrogen Phosphate 0.05M K2HPO4 Weak Base 7.71 7.73 8 Ammonium Chloride 0.2M NH4Cl Weak Acid 4.65 4.67 9 Sodium Hydroxide 0.1M NaOHStrong Base 11.95 11.95 10 Rachel Sodium hydroxide 0.01M NaOHBase 11.61 11.72 11 Ammonia 0.1M NH3 Base 9.53 9.48 12 Vinegar 0.83M HC2H3O2
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pH indicators‚ in chemistry‚ are usually a weak acid or base that are naturally occurring in various plants and flowers and can act as dyes. Some examples of indicators are Litmus (Comes from a plant species called a lichen)‚ Phenolphthalein‚ Thymol blue‚ Bromocresol green and Universal indicator. All these indicators have a certain turning point in color once a certain concentration equilibrium of Hydrogen cations in reached (H +) or a certain concentration equilibrium of H3O+(Also OH - using Arrhenius
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the flask. When phenolphthalein was added to the unknown acid solution‚ the solution remained clear. At first‚ when the NaOH base was added to the unknown acid solution‚ the solution where the base had dropped into changed into a pink colour which disappeared after swirling the flask containing the unknown acid‚ which returns to being clear. However‚ after more NaOH base was added to the unknown acid solution‚ the solution eventually turned pink after swirling the flask. Data processing: As
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Acid Base Titration bre’ana March 1‚ 2013 Purpose: The purpose of this experiment is to determine the concentration of a solution of NaOH by titration with a standard solution of HCl. It was also the purpose to determine the concentration of a sample of white vinegar by titration with a standard solution of NaOH. Introduction: Using the method of titration is how the experiment gets to the conclusion of the concentration of a solution. When doing this experiment‚ measurement is very important
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