Why is Bromocresol green used for the base unknown while phenolphthalein is used for the acid unknown? Explain your answer in terms of the pKa values of the indicators.
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Why is Bromocresol green used for the base unknown while phenolphthalein is used for the acid unknown? Explain your answer in terms of the pKa values of the indicators.
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- The following is list of weak acids and their pką values weak acid pKa benzoic acid 4.20 hydrogen citrate 6.40 hydrocyanic acid 9.31 hydrogen phosphate 12.38 Which would be the best buffer to use at pH 7 ? For benzoic acid, a 50:50 mixture of benzoic acid and its conjugate base, the benzoate ion, would have pH = The buffering capacity of a benzoic acid:benzoate buffer would be at pH = 7 A. 4.20 B. 6.40 C. 9.31 D. 12.38 E. benzoic acid F. hydrogen citrate G. hydrocyanic acid H. hydrogen phosphate I. good J. badWhat will be the pH of a buffer solution containing an acid with a pKa of 5.4 with an acid concentration equivalent to that of its conjugate base?I need help understanding why the ratio of Acetate:Acetic acid = 3.5:1 and why the total amount would be 4.5. The question was calculate the ratio of the concentrations of acetate and acetic acid required in a buffer system of pH 5.30. The pka of acetic is 4.76. Where is the 1 coming from in the ratio 3.5:1 The second part of the question said what if the question aked for the molar concentration of acetate and acetic acid in this buffer given that the over all buffer was 0.5 M. Why is the total amount 4.5?
- What amount of sodium formate must be added to a 1.00 L solution containing 1.28 moles of formic acid in order to make a buffer solution of pH = 4.10. The pKa of formic acid is 3.74.Using the Henderson–Hasselbalch equation calculate the pH. Decide which is the acid and which is the base and use this information to look for the dissociation constant for the acid to determine the pKa.A hypothetical weak acid, HA, was combined with NaOH in the followingproportions: 0,20 mol HA, 0,08 mol NaOH. The mixture was diluted to a totalvolume of 1,0 L and the pH was found to be 4,80. a). What is the pKa of the acid?
- For bromocresol green indicator, the pka of the indicator is about 4.7. Estimate the pH range over which the color change occurs for bromocresol green. What would be the effect on your results if methyl red indicator, pka = 5.0 were used during the experimentAcetic acid’s pKa is 4.75 and nitrous acid’s pKa is 3.16. If you made one buffer of equal parts acetic acid and its conjugate base, then a second buffer of equal parts nitrous acid and its conjugate base, how would the two buffers’ pHs compare to each other? Why?How the pH at the equivalence point is determined by the species present; why the pH at the midpoint of the buffer region equals the pKa of the acid
- After a buffer solution of carbonic acid (with pKa of 3.75) was added with 1ml of sulfuric acid, the resulting pH of the carbonic acid buffer solution is 1.25. Do you think the carbonic buffer system still works effectively after the addition of the said acid?You have a 1L 0.1M citric acid solution at a pH of 3.95 and you add to it 1 molar equivalent of NaOH. What is the resulting pH of the solution? Assume there is no volume change when the NaOH is added to the solution. Citric acid has the following pKa values associated with it: 3.1, 4.8 and 6.4. How can you tell the pka value to use?1. This acid affects other indicators if phenolphthalein is not used in the assay of sodium bicarbonate. 2.Determine the type of assay employed for this substance: SODIUM HYDROXIDE 3.This is the difference between the largest and smallest results in a series of measurements. 4.Determine the color of the indicator in a given condition: PHENOLPHTHALEIN IN AN ACIDIC ENVIRONMENT. 5.This is the weight in grams which is chemically equivalent to 1 gram-atom of hydrogen. CAN YOU HELP ME WITH THIS ONE PLS.. THE ANSWERS ARE ON THE WORD CLOUD (IMAGE ATACHED)