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- What is the purpose of titration? What is the purpose of phenolphthalein? Why is phenolphthalein traditionally used in titrations?What would be the result if Na2SO4 was added to milk? Would one be able to detct the presence of calcium ion by doing this? Would a precipitate result?if the bubble in the tip of the buret is not removed prior to performing HCl titration will the reported concentration of the HCl be greater than, less than, or equal to the true concentration of the HCl if the bubble is pushed from the buret during the titration? (in respect to volumetric analysis)
- if the bubble in the tip of the buret is not removed prior to performing the HCl titration will the reported concentration of the HCl be greater than less than or equal to the true concentration of the HCl if the bubble is pushed from the buret during the titration?Indicate the second endpoint for a citric acid titration (H3C6H5O7 Ka1-7.01x10-4, Ka2-1.70x10-5, and Ka3-6.46x10-6) with a strong base. Choose the most suitable indicator to visually determine the second endpoint of this titration. Briefly explain your selection and describe the color change seen. a. Methyl Yellow (pKa=3.50) changes from red to yellow b. Methyl red (pKa=5.00) changes from red to yellow c. Bromophenol Blue (pKa=4.10) changes from yellow to blue d. Bromocresol green (pKa=4.70) changes from yellow to green e. Neutral Red (pKa=7.00) changes from red to yellow f. Bromothymol blue (pKa=7.30) changes from yellow to blue g. Phenol red (pKa=8.00) changes from yellow to red h. Phenolphthalein (pKa=9.50) changes from colorless to pink i. indigo carmine (pKa=12.00) changes from blue to yellow j. Malachite Green (pKa=12.60) changes from green to colorlessDuring a titration a student used a wet flask to hold the soda sample. How will this affect the concentration of citric acid?
- Why should we do a standardization every time we do a titration of Hcl and NaOH?1. This should be displaced from tips of buret before titration 2. The chemical name of a weak monobasic acid which is soluble in a mixture of alcohol and water. 3. A solution whose concentration is known to a high degree of accuracyWhat is the purpose of adding phenolphthalein to the acid prior to titration? (What would happen if you failed to add phenolphthalein prior to your titration?)