4.3 Exercise 4 - Titrations and indicators 1. 20 cm3 of methanoic acid (Ka = 1.8 x 10-4 moldm-3) of concentration 0.10 moldm-3 is titrated against sodium hydroxide of concentration 0.05 moldm-3. a) Calculate the pH of the solution: i) initially ii) after 10 cm3 of the alkali has been added iii) after 20 cm3 of the alkali has been added iv) after 30 cm3 of the alkali has been added v) after 50 cm3 of the alkali has been added b) Sketch a pH titration
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Titration is a common laboratory method of quantitative chemical analysis that is used to determine the unknown concentration of an identified analyte (wekipedia). The first step will be measuring and combining water and acid (Hydrochloric acid). An indicator anthocyanin will be added to the solution to change the color to pink. Anthocyanin is a water-soluble vacuolar pigment that may appear red‚ purple‚ or blue depending on the pH (Wikipedia). This pink color acts as a pH meter and will show a change
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because they make the investment in getting to know their team. As an aspiring talent leader‚ you don’t have to be a mind reader to get a sense of your employee climate. In fact‚ the Myers Briggs test is a great place to start. The Myer-Briggs type indicator (MBTI) is a personality assessment that scores individuals‚ assigning them 4 letters. The Myers-Briggs Foundation explains the 4 functions as: • Favorite world: Do you prefer to focus on the outer world or on your own
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the reaction between potassium hydroxide and hydrochloric acid : KOH + HCl .The equivalent point of a strong acid or strong base will occur at pH7 . However‚ for the weak acids and bases ‚ the equivalent point will usually no occur at pH 7 .The indicator can be used to estimate the equivalent point by observing the colour change of solution. Objective: To analyze a solution of potassium hydroxide using standard hydrochloric acid theory . Materials: potassium hydroxide distilled
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Complexometric Determination of Water Hardness Chris Breault 2/4/2013 Abstract: Unknown sample #94 was titrated using disodium EDTA to standardize‚ and Erichorchrome Black T as the indicator. Sample 94 was found to have an average water hardness of 268.2 ppm. Introduction The experiment uses disodium salt of EDTA to determine the concentration of metal ion impurities in hard water by complexometric titration. Water gathers impurities by dissolving salts in the earth. The amount of impurities
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Purpose: To test the acidity and basicity of common household products using a premade cabbage juice indicator. Introduction Acids and bases are chemicals commonly used in the lab‚ and‚ even though we may not realize it‚ they are also found in substances we use at home on a daily basis. To test the acidity or basicity of a substance‚ we can titrate each until the endpoint is reached‚ or use an indicator. Something as simple as litmus paper can be used‚ whereby blue litmus paper will turn red in the
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Discussion The acid neutralising capacity (ANC) of 3 brands of calcium carbonate (CaCO3) tablets was determined by reacting the tablets in excess standardized hydrochloric acid (HCl) and then back-titrating with a standardized sodium hydroxide (NaOH) solution. Back titration was required for two reasons. Firstly‚ CaCO3 tablets are poorly water-soluble but dissolve rapidly in acid. Secondly‚ CaCO3 is a weak base so it is difficult to determine the end point of the reaction if titrated directly. Assuming
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examined the result of the various color indicators combined with different buffer solution‚ thereby testing the precision and accuracy of determining the pH value colorimetrically. Colorimetric method is a simple and practical procedure with an important advantage: they do not get out of order as from time to time do the pH-meters. Four buffers (Acetate buffer‚ phosphate buffer‚ ammonium buffer and an unknown solution) were tested with eight different indicators. The method employs the use of complex
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Hydrochloric acid + blue dye 5. Blue dye + Sodium Hypochlorite. Observe & add 1 drop of hydrochloric acid. 6. Potassium iodide + Lead Nitrate. A precipitate should form. 7. Sodium hydroxide + phenolphthalein. a. Phenolphthalein is an acid-base indicator. 8. Hydrochloric acid + phenolphthalein. a. What color would be expected when combining phenolphthalein with an acid or with a base? 9. Sodium bicarbonate + Silver nitrate 10. Silver nitrate + Ammonia a. Using a paper towel‚ absorb the mixture
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descending. The attitude indicator (also known as an artificial horizon) shows the aircraft’s attitude relative to the horizon. From this the pilot can tell whether the wings are level and if the aircraft nose is pointing above or below the horizon. This is a primary instrument for instrument flight and is also useful in conditions of poor visibility. Pilots are trained to use other instruments in combination should this instrument or its power fail. The airspeed indicator shows the aircraft’s speed
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