Answered: How to distinguish between an Acidic…

Chemical Principles in the Laboratory

11th Edition

ISBN:9781305264434

Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi

Publisher:Emil Slowinski, Wayne C. Wolsey, Robert Rossi

Chapter24: The Standardization Of A Basic Solution And The Determination Of The Molar Mass Of An Acid

Section: Chapter Questions

Problem 2ASA: In an acid-base titration, 21.16 mL of an NaOH solution are needed to neutralize 20.04 mL of a...

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How to distinguish between an Acidic Buffer and Acidic Solution as well as Basic Buffer and Basic Solution? Is it based on the color exhibited sol. w/ indicator or pH level of a solution?

Ex.

Solution 1: 30.0 mL 0.10 M CH3COOH

Solution 2: 15.0 mL 0.20 M CH3COOH – 15.0 mL 0.20 M

NaCH3COO

Both used methyl orange as indicator

Solution

Observed Color & Estimated pH range

Classification (acidic/basic & buffer/solution)

1 a 1.0 M HCl Red pH < 3.1 (2.01pH)

b 1.0 M NaOH Orange 3.1 < pH < 4.5 (3.98pH)

c Control Red pH < 3.1 (2.91pH)

2 a 1.0 M HCl Yellow pH > 4.5 (4.73)

b 1.0 M NaOH Yellow pH > 4.5 (4.82)

c Control Yellow pH > 4.5 (4.76)

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