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A) 2.0 mL of 85% (w/w) concentrated H3PO4 (density 1.73 g/cm3) is diluted to 500 mL with water. What is the pH of this solution? B) To prepare a phosphate buffer solution with 7.9 pH, how many mL of 0.25 NaOH should be added to 250 mL of diluted H3PO4 prepared in a)? Kal = 6.3x10-3 Ka2 =6.3 x 10-8 and Ka3 =5 x 10-13 for H3PO4.

A) 2.0 mL of 85% (w/w) concentrated H3PO4 (density 1.73 g/cm3) is diluted to 500 mL with water. What is the pH of this solution? B) To prepare a phosphate buffer solution with 7.9 pH, how many mL of 0.25 NaOH should be added to 250 mL of diluted H3PO4 prepared in a)? Kal = 6.3x10-3 Ka2 =6.3 x 10-8 and Ka3 =5 x 10-13 for H3PO4.

Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter14: Equilibria In Acid-base Solutions
Section: Chapter Questions
Problem 58QAP: Water is accidentally added to 350.00 mL of a stock solution of 6.00 M HCI. A 75.00-mL sample of the...
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A) 2.0 mL of 85% (w/w) concentrated H3PO4 (density 1.73 g/cm3) is diluted to 500 mL with water. What is the pH of this solution? B) To prepare a phosphate buffer solution with 7.9 pH, how many mL of 0.25 NaOH should be added to 250 mL of diluted H3PO4 prepared in a)? Ка1 — 6.3x10-3 Ка2 -6.3 х 10-8 and Ka3 3D5 х 10-13 for HЗРО4.
Transcribed Image Text:A) 2.0 mL of 85% (w/w) concentrated H3PO4 (density 1.73 g/cm3) is diluted to 500 mL with water. What is the pH of this solution? B) To prepare a phosphate buffer solution with 7.9 pH, how many mL of 0.25 NaOH should be added to 250 mL of diluted H3PO4 prepared in a)? Ка1 — 6.3x10-3 Ка2 -6.3 х 10-8 and Ka3 3D5 х 10-13 for HЗРО4.
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