Introduction Background Indicators are used in acid-base titrations to determine end points as both acid and base are colourless in nature. However‚ indicators chosen must be suitable according to the type of reactions such as: - Strong acid-weak base titration - Weak acid-strong base titration - Strong acid-strong base titration - Weak acid-weak base titration Only the first two mentioned above will be investigated in this experiment. Aims/Objectives 1. To understand
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Full Lab Report Experiment #2: Acid-Base Titration Lab Description: Acid-Base Titration Introduction In this lab exercise we will evaluate the effectiveness of several indicators for the determination of the point of completion of a specific acid-base neutralization reaction. We will also determine the unknown concentration of the strong base NaOH by its reaction with a known amount of the weak acid‚ potassium acid phtalate (HKC8H4O4‚ abbreviated KHP). This will be accomplished using the titration
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HCL in the burette. Use a pipette to transfer 10.00mL portion of the solution into a conical flask and drop 5 drops of methyl orange into it by using a dropper. Then‚ slowly open the mouth of the burette and allow HCL to flow into the conical flask containing Ca (OH)₂ and methyl orange as the indicator. Titrate the solution until the yellow colour of the solution turns into orange. Repeat the experiment for several times to get the average reading. The results of the experiment is stated below:-
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swish around fluids every 20 seconds. 5) Add 5 drops of methyl orange to each flask. 6) Record observations. 7) Add 1ml of NaOH until you see a color change (both flasks are the same color) 8) Record amount of NaOH used for each antacid. 9) The flask that needed the least NaOH is best/more effective. 10) Clean your equipment. Observations: Antacid Color MCL acid NaOH Tums Merky liquid‚ yellow 35ml 5ml Rexall Yellowish orange 35ml 5ml Results: In an experiment to determine whether
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organic laboratory techniques inside the lab to get one oriented to the basic methods of procedure that can be used for later experiments. This experiment involves the separation of benzoic acid from a more crude form‚ consisting of benzoic acid‚ methyl orange‚ a common acid/base indicator‚ and cellulose‚ a natural polymer of glucose (Huston‚ and Liu 17-24). The technique that is used to perform this separation is called extraction. Extraction is a systematic process of separating mixtures of compounds
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Observations * all literature values were obtained at www.sigmaaldrich.com Chemical Volume (mL) Mass (g) Density (g/mL) Molecular Weight (g/mol) Methyl-3-nitrobenzoate - 0.1178 - 181.15 Methyl benzoate 2.00 - 1.088 136.00 Sulfuric Acid 0.60 - 1.840 98.08 Nitric Acid 0.15 - 1.510 63.01 Chemical MP Exp. (°C) MP lit (°C) Methyl-3-nitrobenzoate 72.6-75.7 78.0-80.0 Mmole Calculations: HNO3 (16M)- 0.15 mL* (0.016 mole/mL) = 0.0024 mole* (1000 mmol/mole) = 2.4 mmoles
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mistakes that may have been made during the titrations. II. Results A solution of “stomach acid” was created by mixing .6M (moles/liter) hydrochloric acid (HCl) with distilled water to create a solution with a volume of 75 milliliters (mL). Methyl red‚ an indicator that changes colour at a pH of 4.2-6.2‚ was added in order to determine the equivalence point (when amount of acid equals amount of base) of the titration. This was then titrated to the end point (the indicator’s colour change)
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b) to the left c) to the right 4. Remove the CO2 gas being produced 5. concentrations and totals in equilibrium change over time. 6. a) The solution will be yellow. K2CrO4 ( K2+(aq) + CrO42-(aq) b) The solution will be orange. The hydrogen ion will react with chromate to form an equilibrium and produce some dichromate and water. This reaction will cause the amount of chromate to decrease in order to form more products and the equilibrium will shift to the right.
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Experiment No. ___________________ Date ___________________ NEUTRALIZATION TITRATIONS INTRODUCTION The neutralization of hydronium or hydroxide ion to form water is widely used as the basis for volumetric determinations of acids‚ bases and salts of weak acids. The reaction is characterized by a rapid change in pH near the equivalence point‚ a change that is readily detected by an acid-base indicator or that can be followed electrically by use of a pH meter. Neutralization titrations
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Unknown Lab Report April 25th‚ 2006 Introduction The purpose of this lab was to identify two unknown bacteria cultures using various differential tests. The identification of these unknown cultures was accomplished by separating and differentiating possible bacteria based on specific biochemical characteristics. Whether the tests performed identified specific enzymatic reactions or metabolic pathways‚ each was used in a way to help recognize those specifics and identify the unknown cultures
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