A chemist must prepare 800.0 mL of potassium hydroxide solution with a pH of 12.80 at 25 °C.She 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☐x10

Answered: A chemist must prepare 800.0 mL of…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Consider the following data on some weak acids and weak bases: name acetic acid hydrofluoric acid acid solution 0.1 M KCH3CO₂ 0.1 M CH3NH3Br 0.1 M NaI 0.1 M NaF Ka formula HCH3CO₂ 1.8 x 10 HF 6.8 × 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. X -4 pH choose one choose one choose one choose one base Ś Kb formula methylamine CH3NH₂ 4.4 x 107 CHN 1.7×10 9 name pyridine
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 ?
The chemical formulae of some acids are listed in the first column of the table below, and in the second column it says whether each acid is strong or weak. Complete the table. List the chemical formula of each species present at concentrations greater than about 10-6 mol/L when about a tenth of a mole of the acid is dissolved in a liter of water. acid HIO3 HF HBr HC10₂ strong or weak? strong weak strong weak species present at 10-6 mol/L or greater when dissolved in water 0 7 0 0
A chemist dissolves 877.mg of pure hydroiodic acid in enough water to make up 90.mL of solution. Calculate the pH of the solution. Be sure your answer has the correct number of significant digits.
A chemist must prepare 600.0mL of nitric acid solution with a pH of 0.90 at 25°C. He will do this in three steps: Fill a 600.0mL volumetric flask about halfway with distilled water. Measure out a small volume of concentrated (9.0M) 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 dissolves 339. mg of pure hydroiodic acid in enough water to make up 180. mL of solution. Calculate the pH of the solution. Round your answer to 3 significant decimal places. Ú x10 ×
A chemist must prepare 400.0 mL of hydrochloric acid solution with a pH of 1.20 at 25 °C. He will do this in three steps: • Fill a 400.0 mL volumetric flask about halfway with distilled water. • Measure out a small volume of concentrated (8.0M) stock hydrochloric acid solution and add it to the flask. • Fill the flask to the mark with distilled water. Calculate the volume of concentrated hydrochloric acid that the chemist must measure out in the second step. Round your answer to 2 significant digits. |mL x10
A chemist must prepare 550.0 mL of hydrochloric acid solution with a pH of 1.10 at 25 °C. He will do this in three steps: • Fill a 550.0 mL Vvolumetric flask about halfway with distilled water. • Measure out a small volume of concentrated (9.0M) stock hydrochloric acid solution and add it to the flask. • Fill the flask to the mark with distilled water. Calculate the volume of concentrated hydrochloric acid that the chemist must measure out in the second step. Round your answer to 2 significant digits. OmL Ox10 ?
Consider the following data on some weak acids and weak bases: name acetic acid hypochlorous acid 0.1 M KCI acid solution 0.1 M KCIO 0.1 M C6H5NH3Br 0.1 M NH4CI formula HCH3CO₂ 1.8 x 10-5 HCIO Ra 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. 3.0 × 10 pH choose one -8 choose one choose one base choose one ✓ Ko name formula aniline C6H5NH₂ 4.3 × 10¯ - 10 ammonia NH3 1.8 × 10
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Predicting the qualitative acid-base properties of salts Consider the following data on some weak acids and weak bases: name formula hydrocyanic acid HCN hydrofluoric acid HF acid solution 0.1M NaCN 0.1MKCI 0.1MKF 0.1MHONH, CI K₁ 4.9 × 10 10 6.8 x 10 PH -4 base 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. K₂ formula hydroxylamine HONH₂ 1.1 x 10 0-8 pyridine C₂H₂N 1.7 x 109 name
4

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