slightest excess of OH ions). The color change in a titration is called the endpoint. At the equivalence point of the titration‚ the moles of OH (base) are equivalent to the moles of H+ (acid) in the sample. The moles of OH added to the solution from a buret are calculated from the concentration of the base (MOH) and the volume of base (VOH) added‚ as: V (L) n (mol) Lmol MOH OH OH The lab goal is to determine the molar mass of an unknown monoprotic acid. The grams of acid are determined from weighing
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sure the volumetric flasks are clean. If they appear dirty‚ wash them with soap and water‚ and do a final rinse with DI water. Dry the outside completely. The inside may remain wet since DI water will be added to the flask. Label three of the volumetric flasks #2-4. 2. Obtain about 50 mL of the stock solution in a 100 mL beaker. Transfer about half of the solution to a large test tube labeled #1. Use only about 10 mL of solution to condition a 25.00 mL volumetric pipet‚ then use the pipet to transfer
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Thermochemistry: An Ice Calorimeter Determination of Reaction Enthalpy D. F. Nachman 6/23/2010 Abstract: An ice calorimeter was used to study the reaction of magnesium metal and 1.00M sulfuric acid solution: Mg(s) + H2SO4(aq) →MgSO4(aq) + H2(g). We found the experimental molar enthalpy of reaction to be ΔH = –355 ± 17 kJ/mol at 0°C‚ 24% lower than the textbook value of ΔH° = –466.9 kJ/mol‚ reported at 25°C. Introduction Whether a chemical reaction occurs spontaneously or is driven by an outside
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Analysis of Soda Ash and Volumetric Analysis of a Carbonate-Bicarbonate Mixture Buti‚ Mary Daphne A. Department of Chemical Engineering‚ Faculty of Engineering University of Santo Tomas España‚ Manila Abstract Sodium carbonate (Na2CO3)‚ commonly known by trade name soda ash‚ is a white‚ anhydrous‚ powdered or granular material that is an essential raw material used in the manufacturing of glass‚ detergents‚ chemicals‚ and other industrial products. In this experiment‚ the percent alkalinity
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Determining Stoichiometric Ratios: NaOH and HCl & NaOH and H2SO4 Reactions Contents Introduction 3 Materials & Procedure 4 Raw Data 8 Processed Data 15 Graphs 16 Conclusion & Evaluation 17 Introduction Background Information Stoichiometry is a critical component in chemistry‚ and helps in understanding the quantitative relationship between the number of moles of reactants and products in a reaction. Objective In this experiment‚ the reactions
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Graduated Cylinder Pipet Stirring rod Buret with clamp Stopper Ring Stand Utility Clamp Computer Computer Program pH probe Procedure: 1) 2) Goggles were put on. 3) 0.1 M NaOH solution was made using 0.4 g NaOH and 100 mL distilled water. The ingredients were added together in a beaker and stirred. 4) The buret was standardized by adding 10 mL of distilled water‚ rolling the buret‚ and then pouring it out two times. 5 mL of distilled water was then added to buret‚ rolled‚ and then
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Feb. 19‚ 2015 Liangting Lin 1-4 Lab Partner: Sunny Zhao 20C: Acid-Base Titration Purpose/Objective: 1. To titrate a hydrochloric acid solution of unknown concentration with 0.50M sodium hydroxide‚ and determine the molarity of the hydrochloric acid 2. To titrate an acetic acid solution with 0.50M sodium hydroxide‚ and determine the molarity and percentage composition of the vinegar. Apparatus
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was to identify the molarity of a solution of chloride. Laboratory In lab we had to perform titrations and carefully read the burets. Data and Calculations: Analysis of Unknown Chloride Molarity of Standard AgNo3 solution 0.02785M I II III Initial buret reading 0.00 mL 0.00 mL 0.10 mL Final buret reading 17.00 mL 16.40 mL 17.50 mL Volume of AgNo3 used to titrate sample 17.00 mL 16.40
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the gas from the valves at the lab tables. First a coil had to be made out of copper‚ which would serve as the burner for the detection system. A pipet was used as the column to put the solid stationary substance into. The solid phase in this experiment was Tide. The pipet was filled with Tide detergent and cotton was inserted in both end of the pipet. The column was then secured horizontally to a ring stand using clamps. The tip of the column should be in a vertical position. The copper coil
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Objective Determine the concentration of acetic acid of vinegar‚ in terms of (m/m). Introduction Neutralization is a reaction of an acid with a bases to produce a salt and water. For example‚ the reaction of the strong acid HCl with the strong base NaOH produces the salt sodium chloride and water HCl(aq) NaOH(aq) ( NaCl(aq) H2O(l) Since the acid‚ base‚ and salt in this reaction are all strong electrolytes‚ the net ionic equation for this reaction is H(aq) OH-(aq) ( H2O(l) This same result
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