You will use a conductometric titration to determine an unknown weak acid sample. a) Prepare 100...
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You will use a conductometric titration to determine an unknown weak acid sample. a) Prepare 100 mL of the unknown weak acid by weighing out approximately 1.2 g of the sample provided. You need to record and know accurately the mass of unknown weak acid used. b) Pipette 10.0 mL of the unknown acid solution into a 250 mL beaker. c) Added 220 mL of deionised water to the beaker. i) Place the beaker on magnetic stirrer and add a stirrer bar. The titration Setup requires a 10 mL micro burette, the conductivity probe clamped and ensure the probe is completely submerged. Check that the initial conductivity of the solution is <2000 uS, if not add an extra 10 ml. of water to the beaker or ask your demonstrator for assistance. d) Ensure the stirrer is running and record the initial conductivity reading. Add 10 drops of Phenolphthalein indicator. j) Titrate using the previously prepared and standardised 0.3 M sodium hydroxide solution by adding 0.2 millilitre amounts of base and recording the conductivity reading after each addition. Remember to record the volume when there is an obvious change in indicator colour. Add a further 20 additions of sodium hydroxide after the indicator changes colour. k) Plot the conductivity versus volume of sodium hydroxide. You are encouraged to do this in the laboratory if possible. 1) Determine the endpoint, or endpoints, Possible weak acids include; formic, acetic, oxalic dihydrate, tartaric and citric monohydrate. A table of relevant ionic molar conductivities are provided in the Appendix for this practical. You will use a conductometric titration to determine an unknown weak acid sample. a) Prepare 100 mL of the unknown weak acid by weighing out approximately 1.2 g of the sample provided. You need to record and know accurately the mass of unknown weak acid used. b) Pipette 10.0 mL of the unknown acid solution into a 250 mL beaker. c) Added 220 mL of deionised water to the beaker. i) Place the beaker on magnetic stirrer and add a stirrer bar. The titration Setup requires a 10 mL micro burette, the conductivity probe clamped and ensure the probe is completely submerged. Check that the initial conductivity of the solution is <2000 uS, if not add an extra 10 ml. of water to the beaker or ask your demonstrator for assistance. d) Ensure the stirrer is running and record the initial conductivity reading. Add 10 drops of Phenolphthalein indicator. j) Titrate using the previously prepared and standardised 0.3 M sodium hydroxide solution by adding 0.2 millilitre amounts of base and recording the conductivity reading after each addition. Remember to record the volume when there is an obvious change in indicator colour. Add a further 20 additions of sodium hydroxide after the indicator changes colour. k) Plot the conductivity versus volume of sodium hydroxide. You are encouraged to do this in the laboratory if possible. 1) Determine the endpoint, or endpoints, Possible weak acids include; formic, acetic, oxalic dihydrate, tartaric and citric monohydrate. A table of relevant ionic molar conductivities are provided in the Appendix for this practical.
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a Preparation of Unknown Weak Acid Solution Weigh out approximately 12 g of the provided unknown weak acid sample accurately record the mass Dissolve ... View the full answer
Related Book For
Fundamental accounting principle
ISBN: 978-0078025587
21st edition
Authors: John J. Wild, Ken W. Shaw, Barbara Chiappetta
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