Methyl red, bromocresol green, methyl orange, bromothymol blue pKas MR .8 BG 4.7

Question

Methyl red, bromocresol green, methyl orange, bromothymol blue pKas MR .8 BG 4.7 MO 4.2 BB 7.1 ill valties with the joul caieulations (of course you should still report correct number of significant figures). 1 of the remaining values, calculate the best average and 95% confidence (d) Using all (e) Complete the data sheet and submit it along with the answers to la-1d. nalyzing the Titration Curve (Refer to Figure 8.1) (a) What is the volume of HCl that corresponds to the equivalence point? b) What is the the pH at the equivalence point? Which of the indicators that we used c) Based on the pKa's of the indicators used and your examination of the titration interval for the concentration of HCl and the relative standard deviation. in this experiment would be the best choice for this titration? Explain. curve for tris, predict which indicator would be expected to give the largest HCI concentration from titration. Explain your choice. d) Do the HCl molarities for the class agree qualitatively with the titration curve and the pH ranges for the indicators that were used by the class? Explain. Based on the pKa's of the indicators used and your examination of the titration curve for tris, predict which indicator would be expected to produce the largest standard deviation, s, in the HCI concentration from titration. Explain your choice. e)

Explanation / Answer

Hello.

Question a. The inflexion point shows the equivalent point, therefore, it appears when 40 mL of acid is added.

Question b. pH at the equivalente point is in the range of 4-6. Considering the interval pH color change, MR (4.2 - 6-2) would be the best choice.

Question c. if the result is the largest concentration of HCl then the lowest pka indicators is used because ka would be greater therefore the balance of H+ would be higher.

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