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.

Appl Of Ms Excel In Analytical Chemistry
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Chapter8: Polyfunctional Acids And Bases
Section: Chapter Questions
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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.
Transcribed Image Text: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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