Bromocresol green Yellow to blue during weak acid to strong base( 5.70 pH, 9.8 mL), blue to yellow during weak base to strong acid( 3.57 pH, 8.1 mL). Phenolphthalein Clear to pink during weak acid to strong base (8.15 pH, 10.4 mL), pink to clear during weak base to strong acid (7.78pH, 7.4 mL) Methylamine (CH3NH2) is neutralized by nitric acid in the following reaction: CH3NH3++H20=H3O++CH3NH2 In a titration using this reaction, it takes 43.44 mL of nitric acid to reach the equivale point with a 108.6 mL sample of methylamine. The Kb of methylamine is 4.4x10-44.4×10-4.

Bromocresol green Yellow to blue during weak acid to strong base( 5.70 pH, 9.8 mL), blue to yellow during weak base to strong acid( 3.57 pH, 8.1 mL). Phenolphthalein Clear to pink during weak acid to strong base (8.15 pH, 10.4 mL), pink to clear during weak base to strong acid (7.78pH, 7.4 mL) Methylamine (CH3NH2) is neutralized by nitric acid in the following reaction: CH3NH3++H20=H3O++CH3NH2 In a titration using this reaction, it takes 43.44 mL of nitric acid to reach the equivale point with a 108.6 mL sample of methylamine. The Kb of methylamine is 4.4x10-44.4×10-4.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Bromocresol green
Yellow to blue during weak acid to strong base( 5.70 pH, 9.8 mL), blue to yellow
during weak base to strong acid( 3.57 pH, 8.1 mL).
Phenolphthalein
Clear to pink during weak acid to strong base (8.15 pH, 10.4 mL), pink to clear
during weak base to strong acid ( 7.78pH, 7.4 mL)
Methylamine (CH3NH2) is neutralized by nitric acid in the following reaction:
CH3NH3++H2O=H3O*+CH3NH2
In a titration using this reaction, it takes 43.44 mL of nitric acid to reach the equivalence
point with a 108.6 mL sample of methylamine. The Kb of methylamine
is 4.4×10-44.4×10-4.
what indicator (phenolphthalein or bromocresol green) would you pick for this titration?
(Hint: you will need to calculate the pH at the equivalence point.) Explain why you have
chosen as you have, including any ways in which your choice is less than ideal.TO
calculate the pH, you will need the Ka calculation equation, and the Ka.

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