A chemist must prepare 800.0 mL of potassium hydroxide solution with a pH of 13.50 at 25 °C. He will do this in three steps: • Fill a 800.0 mL volumetric flask about halfway with distilled water. • Weigh out a small amount of solid potassium hydroxide and add it to the flask. • Fill the flask to the mark with distilled water. Calculate the mass of potassium hydroxide that the chemist must weigh out in the second step. Round your answer to 2 significant digits. g 0 x10 X

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter14: Acids And Bases
Section: Chapter Questions
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A chemist must prepare 800.0 mL of potassium hydroxide solution with a pH of 13.50 at 25 °C.
He will do this in three steps:
• Fill a 800.0 mL volumetric flask about halfway with distilled water.
• Weigh out a small amount of solid potassium hydroxide and add it to the flask.
• Fill the flask to the mark with distilled water.
Calculate the mass of potassium hydroxide that the chemist must weigh out in the second step. Round your answer to 2 significant digits.
18
x10
×
Transcribed Image Text:A chemist must prepare 800.0 mL of potassium hydroxide solution with a pH of 13.50 at 25 °C. He will do this in three steps: • Fill a 800.0 mL volumetric flask about halfway with distilled water. • Weigh out a small amount of solid potassium hydroxide and add it to the flask. • Fill the flask to the mark with distilled water. Calculate the mass of potassium hydroxide that the chemist must weigh out in the second step. Round your answer to 2 significant digits. 18 x10 ×
A chemist dissolves 815. mg of pure barium hydroxide in enough water to make up 110. mL of solution. Calculate the pH of the solution. (The
temperature of the solution is 25 °C.)
Be sure your answer has the correct number of significant digits.
1
x10
X
Transcribed Image Text:A chemist dissolves 815. mg of pure barium hydroxide in enough water to make up 110. mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25 °C.) Be sure your answer has the correct number of significant digits. 1 x10 X
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