A. The sodium hydroxide solution was not mixed thoroughly after diluting with deionized water. B. A student fails to swirl the Erlenmeyer flask during the addition of NaOH solution during the titratio
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A. The sodium hydroxide solution was not mixed thoroughly after diluting with deionized water.
B. A student fails to swirl the Erlenmeyer flask during the addition of NaOH solution during the titration.
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- Why do you need to swirl the flask constantly during the titrimetric analysis? a. To prevent the accumulation of phenolphthalein on the center of the solution b. To preserve the sample c. To distribute the titrant throughout the sample d. To look cool during the experimentWhy is the titration done with vigorous swirling?The Diela Alder reaction used a mixed solvent recrystallization to purify the product. In general describe how a mixed solvent recrystallization works.
- Draw an extraction flow chart for the extraction of a mixture of organic acid and phenol.Why are ice and water added to the reaction mixture after the reaction was completed? A. To increase the volume of the solution.B. To deprotonate the intermediate to form the productC. To protonate the intermediate to form the productD. To dilute the solution before filtration to avoid that the filter paper to dissolveIn order to keep as much HCHO dissolved in the water in the embalming machine reservoir as possible, the dilution water should be ___. Hot Cold
- Explain how the reported solubility product of borax will be affected if some of the solid borax is inadvertently transferred into the Erlenmeyer flask and included in the titration analysis.For a Kjeldahl analysis: you weighed 0.0312 g unknown dried blood sample and digested it with concentrated H2SO4. After the distillation into boric acid solution, Methyl Purple indicator changed its color to green. During titration with 0.0110 M H2SO4 it took 15.35 mL of this H2SO4 solution to bring the color of the mixture to grey-blue. a) What number of moles of H2SO4 reacted? b) What number of moles of boric acid reacted with NH3 during distillation? c) What number of moles of NH3 was produced during distillation? d) What was mass of N in the produced NH3? e) What is %N w/w in the original sample?Why is it not necessary to know the exact volume of deionized water added when preparing the samples for titration?
- Why should be solution of sodium bicarbonate be boiled during titration with HCI?Chemistry Nitric acid solutions with a pH of about 5 are often used to simulate acid rain. A nitric acid solution with a pH of 5 has a concentration of 0.00001 M. Describe how to prepare 10 mL of a 0.00001 M solution using a 1 M stock solution and the serial dilution techniqueAccurately weigh out about 6g copper(ii) sulfate crystals into a weighing boat. Use the copper(ii) sulfate crystals to make up 250cm3 of standardized copper (ii) sulfate solution Pipette 25cm3 of this solution into a conical flask Add 1.5g potassium iodide and swirl thoroughly Titrate this solution with standard 0.1 moldm-3 Na2S2O3 in a burette. When the iodine color fades, add 1 cm3 starch indicator. Use your titration data below to calculate the percentage by mass of copper in the copper(ii) sulfate crystals.