known concentration of EDTA solution. The EDTA ion is water soluble so it will react with the Ca 2+ to form a complex. Such titration is known as complexometric titration. The end point of the titration is detected by Eriochrome black T indicator. It shows a colour change from red to blue. To find the moles of the calcium in the milk samples‚ the mean volume of EDTA that brings the colour change will be multiplied by its concentration. Dividing the mole by the volume of the sample used
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Instructor: Professor Jennifer Frere Date: 03.08.2015 Predictions Sucrase will have the greatest activity at pH 6 Sucrase will have the greatest activity at 60 °C (140 °F) Sucrase activity decreases with increasing sucrose concentration Materials and Methods Effect of pH on Enzyme Activity Dependent Variable amount of product (glucose and fructose) produced Independent Variable pH Controlled Variables temperature‚ amount of substrate (sucrose) present‚ sucrase + sucrose incubation time Effect
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prepare 100.0 mL of NaOH(aq) that has a pH = 13.62? 2. What is the [OH-] in 0.025 M HCl ? 3. What is the pH of 0.50 M Sr(OH)2 ? 4. The pH of an aqueous solution is 10.32. The [OH-] is …………………… 5. The [H+] in 0.050 M Mg(OH)2 at 25oC is ………………………. 6. The pH of 0.20 M HNO3 is ……………………. 7. A solution is prepared by adding 200. mL of 0.125 M of HCl to a 500.0mL volumetric flask and filling it to the mark with water. The pH of this solution is ………. 8. Consider
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Lewis acid. At room temperature‚ it exists as white powder or colourless crystals with a chemical formula of H3BO3 or B(OH)3. Apparatus and materials: •Sodium tetraborate •Concentrated hydrochloric acid •Concentrated sulphuric acid •Methyl red indicator •Mannitol •Beaker •Methanol •Distilled water •Electric heater •Ice •Test tube •Test tube rack •Glass rod •Suction funnel •Suction pump •Filter flask •Filter paper •Spatula •Watch glass •Splint Procedures: 1. About 10g
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determined using a Fischer-Johns melting point apparatus. The acid then dissolved in separate beakers with 95% ethanol and water and titrated with 0.050 M NaOH‚ previously standardized with potassium hydrogen phthalate‚ through potentiometric titration. The pH after addition of base was measured and plotted against the volume of titrant added using three different plots. Results show a 61.0% yield and the melting point differed from the theoretical by a range of 3.11-6.83%. The pKa calculated was 2.865‚ differing
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115 02386600 POA indicators defined as Present on Admission variables‚ which are reported on an inpatient claim‚ indicate the primary & secondary diagnosis‚ that were present at the time the inpatient admission occurs. POA indicators are required for all claims involving Medicare Inpatient admissions to general IPPS acute care hospitals‚ or facilities that are subject to regulations mandating the collection of POA indicator information. POA indicators are used when submitting
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Enzyme Activity cheryl yelton November 30‚ 2014 Predictions 1. Sucrase will have the greatest activity at pH 6 2. Sucrase will have the greatest activity at 40 °C (104 °F) 3. Sucrase activity increases with increasing sucrose concentration. Materials and Methods Effect of pH on Enzyme Activity. 1. Dependent Variable. amount of product (glucose and fructose) produced 2. Independent Variable. pH 3. Controlled Variables. temperature; amount of substrate (sucrose) present; sucrase + sucrose incubation
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polyethene polychloroethene polyphenylethylene A student was shown a demonstration in which a sample of an element was heated strongly in air‚ and the powder produced by the reaction was added to water. When tested with a pH probe connected to a data logger‚ the resulting solution had a pH of 9. Which one of the following elements could have been used? (A) (B) (C) (D) S C Si Ca 3. A few drops of bromine water are added to an unknown colourless hydrocarbon. No chemical change was observed after allowing
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Attitude Indicator (Artificial Horizon) The Attitude Indicator shows rotation about both the longitudinal axis to indicate the degree of bank‚ and about the lateral axis to indicate pitch (nose up‚ level or nose down). It utilizes the rigidity characteristic of the gyro. It is gimballed to permit rotation about the lateral axis indicating pitch attitude‚ and about the longitudinal axis to indicate roll attitude. Once powered up‚ the indicator is maintain in a fixed position no matter what
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Acids And BAses Acids And BAses 8.1 8.2 8.3 8.4 18.1 18.2 18.3 18.4 18.5 Theories of acids and bases Properties of acids and bases Strong and weak acids & bases The pH scale Calculations involving acids and bases (AHL) Buffer solutions (AHL) Salt hydrolysis (AHL) Acid-base titrations (AHL) Indicators (AHL) 8 8.1 THeORies OF Acids And BAses 8.1.1 Define acids and bases according to the Brønsted–Lowry and Lewis theories. 8.1.2 Deduce whether or not a species could act as a Brønsted–Lowry
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