A chemist must prepare 500.0 mL of sodium hydroxide solution with a pH of 13.00 at 25 °C. He 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 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. 0 g 0 x10 X

Consider the following data on some weak acids and weak bases: name hydrocyanic acid acid hydrofluoric acid 0.1 M KBr solution 0.1 M HONH3Cl 0.1 M CH3NH3Br 0.1 M NaCN formula HCN HF Ka 4.9 × 10 6.8 × 10 - 10 Use this data to rank the following solutions in order of increasing pH. In other words, select a '1' next to the solution that will have the lowest pH, a '2' next to the solution that will have the next lowest pH, and so on. pH 4 choose one choose one ✓ choose one ✓ base choose one ✓ Kh formula methylamine CH3NH₂ 4.4 x 10-4 name hydroxylamine HONH₂ 1.1 × 10¯ 8

A chemist must prepare 200.0 mL of nitric acid solution with a pH of 1.20 at 25 °C. He will do this in three steps: • Fill a 200.0 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. ml.

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

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 350.0 mL of hydrobromic acid solution with a pH of 1.80 at 25 °C. He will do this in three steps: • Fill a 350.0 mL volumetric flask about halfway with distilled water. • Measure out a small volume of concentrated (7.0M) stock hydrobromic acid solution and add it to the flask. • Fill the flask to the mark with distilled water. Calculate the volume of concentrated hydrobromic acid that the chemist must measure out in the second step. Round your answer to 2 significant digits. mL x10 Explanation Check O 2022 McGraw Hill LLC, All Rights Reserved. Terms of Use Privacy Center Acce: 80°F Cloudy DELL Esc F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 PrtScr Insert Delete F1 "R A # $4 & Backspace 1 3 4 6 80 E Y *00

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 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