Quantity of Ascorbic Acid in Vitamin C tablet Titration Results: 1000 μL aliquots of diluted Vitamin C solution against NBS solution Please only fill in 3 concordant results! Titration number: Final burette reading (mL) Initial burette reading (mL) Titre (mL) 1 2 3 Error 14.90 30.0 15.3 ±0.05 mL 0.00 14.90 0.00 ±0.05 mL 14.90 15.10 15.3 ±0.10 mL Average (mean) volume of concordant titres: mL The mass of Ascorbic Acid in Vitamin C tablet (to 3 sig figs): g

Sample # 1 2 0.2425 0.2160 0.2274 Weighed mass of ascorbic acid (g) volume of KIO3 (mL) 18.86 17.91 17.37 0.02459 0.02462 0.02432 [KIO3] (mol L-1) Mean [KIO3] (based on titration) 0.02451 mol L-1 Standard deviation in the mean [KIO3] mol L-1 Confidence limit for the [KI03] mol L-1 Relative confidence limit for the [KIO3] ppt =

CHM2045 Titration of an Antacid St. Petersburg CollegeName:_________________________ Date: __________________Recorded DataSample number Trial One Trial TwoMolarity of NaOH solution (fromprevious experiment orprovided)Molarity of HCl solutionMass of antacid tabletInitial volume of HCl fordissolving tabletFinal volume of HCl fordissolving tabletInitial volume of NaOHFinal volume of NaOHCalculated DataTrial One Trial TwoVolume of HCl added to dissolvetabletVolume of NaOH usedMoles of HCl addedMoles of NaOH addedMoles of HCl neutralized byNaOHMoles of HCl neutralized by thetabletMoles of CaCO3Grams of CaCO3Mass percent CaCO3 per gramof tablet usedAverage mass percent CaCO3 Sheet 6: Titration 2 Antacid Dry Lab Data (Titration 2)         Sample Number #9 Trial 1 Trial 2 Unit   Molarity of NaOH solution 0.1387 M   Molarity of HCl solution 0.1025 M   Mass of antacid tablet 0.1265 0.1225 g   Initial volume of HCl for dissolving tablet 0.65 20.05 mL   Final volume of HCl for…

A drug is ordered to be administered IV at the initial rate of 4 mU/min, and may increase by 2 mu/min q 15 min to a max of 10 mU/min. The IV strength is 5 mU/mL. Construct the first two lines of the titration table for this order. O A. Dose Rate (mU/min) IV rate (mL/h) 4 mU/min (initial) 8 mU/min 36 mL/h 48 mL/h O B. Dose Rate (mU/min) 4 mU/min (initial) 6 mU/min Oc. Dose Rate (mU/min) 4 mU/min (initial) 6 mU/min O D. Dose Rate (mu/min) 4 mU/min (initial) 6 mu/min IV rate (mL/h) 24 mL/h 48 mL/h IV rate (mL/h) 48 mL/h 72 mL/h IV rate (mL/h) 36 mL/h 36 mL/h

A student carries out a titration to determine the molar mass and structure of a weak acid A. The student follows the method below. Dissolve a weighed mass of A in 100 cm3 of distilled water and make the solution up to 250 cm in a beaker. Add the solution of A to a burette. Titrate the solution of A with a standard solution of sodium hydroxide, NAOH. (a) What is meant by the term standard solution? (b) Sodium hydroxide is an alkali. What is meant by the term alkali? (c) The student carries out a trial, followed by three further titrations. The diagram shows the initial and final burette readings for the three further titrations. The student measures all burette readings to the nearest 0.05 cm3. Titration 1 Titration 2 Titration 3 Initial reading Final reading Initial reading Final reading Initial reading Final reading 27

Question 4. The titration curve for histidine is shown below. The pK values for the carboxyl group (pK₁) and the amino groups (pK2) are shown. The pK value of the side chain is indicated as PKR. (a) 10- Histidine 8 PH 6 MG&D 2014/15 4 2 (Difficulty = 2; LO 1.8) pk₁ = 1.82 ___== H₂N-CH PKR = 6.0 Indicate which of the 4 ionisation species shown predominate at pH 1, 3, 7 and 11. H 2.0 pK₂ = 9.17 1.0 OH (equivalents) COOH H₂N-CH H₂N-CH CH₂ CH₂ 1111 H H H COO™ 3.0 H H Pane 10 COO™ H₂N-CH CH₂ H H -N (b) The protonated (charged) form of the side chain of histidine is believed to be important for the functioning of a particular enzyme. At pH 7, what percentage of the enzyme will be active? (Difficulty = 2/3; LO 1.5, 1.8)

A chemist generates the titration curve shown by slowly adding 0.1 M sodium hydroxide (NaOH) to 25 mL of 0.1 M lactic acid (CH₂CH(OH)COOH). What is the approximate pK₁ of lactic acid? pK₂ = 412108642 등 8 0 10 30 Volume of base (mL) 20 40 50

How much calcium would you ingest by drinking one 8 oz glass of your tap water? Show all calculations.

Lab Data - X Standardized NaOH (M) 0.4102 Initial volume of buret (mL) 0.90 Volume of vinegar (mL) 10.00 Observations The titration reaches completion at 18.3 mL. The solution remains pink for longer than 30 seconds Final volume of buret (mL) 18.30 Volume of NaOH (mL) 17.40 Molarity of acetic acid (M)

Understanding of food analysis methods.  Principles of method described compared to other techniques.   1 The MOHR Titration, AOAC Method? What is it and how does it work? How can it be used to quantify salt in a sample. 2 Are there any advantages and/or disadvantages of this method?3 Are there any alternate methods better than the Mohr Titration toquantitatively determine salt in a sample? 4. Diseases with recent statistics? Refer to World Health Organisation? 5. Why analayse salt? 6. Consumption? 7.  Main aims of study?