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Why use basic buffer solution in an experiment for hard water analysis?
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- Why is the titration done with vigorous swirling?What makes bromocresol green and phenolphthalein suitable for the double-indicator process?What is the importance of calibrating pH electrode and weighing balance during buffer preparation? What will happen if either of them is uncalibrated? Which will result to bigger error?
- Why is it not necessary to know the exact volume of deionized water added when preparing the samples for titration?What factor affects the ‘strength’ of a buffer? Why was benzoic acid used as a solvent when making up the glucose stock standard solution?Describe what is done in a displacement titration and give an example.
- When one would like to run an experiment with EDTA, sometimes it is necessary to do back titration. When do you think that the back titration is necessary? Give at least three situations where the back titrations are required.What is the result and discussion for experiment determination of Hardness of water EDTA titration?Why did the color of the solution in the conical flask change at the end of the titration?
- Why are many ionic precipitates washed with electrolyte solution instead of pure water?What is the rationale of diluting the solution in the flask with washing distilled water at the start or in the middle of a titration? Can this step affect the calculations?In this experiment, you will take a 25.00 mL aliquot of vinegar and dilute it to 250.0 mL. You will then take a 25.00 mL aliquot from this diluted vinegar solution and titrate it against the standardised sodium hydroxide. The titration between acetic acid and sodium hydroxide is a 1:1 stoichiometry. If your standardised sodium hydroxide solution was determined to be 0.060 M, and it required an average titre (titration volume) of 20.3 mL, what is the concentration (in M) of the undiluted vinegar sample (the initial vinegar sample)? Provide your answer to 2 significant figures.