A chemist must prepare 500.0 mL of potassium-hydroxide solution with a pH of 13.40 at 25 °C. She will do this in three steps: • Fill a 500.0 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.

A chemist must prepare 850.0 mL of sodium hydroxide solution with a pH of 12.60 at 25 °C. He will do this in three steps: • Fill a 850.0 mL volumetric flask about halfway with distilled water. • Weigh out a small amount of solid sodium hydroxide and add it to the flask. • Fill the flask to the mark with distilled water. Calculate the mass of sodium hydroxide that the chemist must weigh out in the second step. Round your answer to 2 significant digits. Ox10

A chemist must prepare 900.0 mL of sodium hydroxide solution with a pH of 13.40 at 25 °C. He will do this in three steps: • Fill a 900.0 mL volumetric flask about halfway with distilled water. • Weigh out a small amount of solid sodium hydroxide and add it to the flask. • Fill the flask to the mark with distilled water. Calculate the mass of sodium hydroxide that the chemist must weigh out in the second step. Round your answer to 2 significant digits. Ox10

A chemist must prepare 500.0 mL of nitric acid solution with a pH of 0.60 at 25 °C. He will do this in three steps: Fill a 500.0 mL volumetric flask about halfway with distilled water. ● • Measure out a small volume of concentrated (7.0M) stock nitric acid solution and add it to the flask. Fill the flask to the mark with distilled water. Calculate the volume of concentrated nitric acid that the chemist must measure out in the second step. Round your answer to 2 significant digits.

A chemist must prepare 800.0 mL of potassium hydroxide solution with a pH of 12.30 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.

A chemist dissolves 522. mg of pure potassium hydroxide in enough water to make up 120. mL of solution. Calculate the pH of the solution. (The temperature of the solution is 25 °C.) Round your answer to 3 significant decimal places. x10 5

A chemist must prepare 850.0 mL of potassium hydroxide solution with a pH of 12.60 at 25 °C. She will do this in three steps: • Fill a 850.0 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. 6.0 0x10 X Ś ?

A chemist dissolves 359. mg of pure sodium 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.) Round your answer to 3 significant decimal places. x10 X Ś

A chemist must prepare 450.0 mL of nitric acid solution with a pH of 1.60 at 25 °C. He will do this in three steps: • Fill a 450.0 mL volumetric flask about halfway with distilled water. • Measure out a small volume of concentrated (5.0M) stock nitric acid solution and add it to the flask. • Fill the flask to the mark with distilled water. Calculate the volume of concentrated nitric acid that the chemist must measure out in the second step. Round your answer to 2 significant digits. ||mL 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. 0 x10 ×