A chemist must prepare 550.0 mL of potassium hydroxide solution with a pH of 13.90 at 25 °C. He will do this in three steps: • Fill a 550.0 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.

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A chemist must prepare 550.0 mL of potassium hydroxide solution with a pH of 13.90 at 25 °C.
He will do this in three steps:
• Fill a 550.0 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.
x10
Transcribed Image Text:A chemist must prepare 550.0 mL of potassium hydroxide solution with a pH of 13.90 at 25 °C. He will do this in three steps: • Fill a 550.0 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. x10
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