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How many grams of dry NH4Cl need to be added to 2.50 L of a 0.200 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.74? Kb for ammonia is 1.8 x 10-5 Express your answer with the appropriate units. ► View Available Hint(s) mass of NH₂Cl = Value Submit Part A Volume of KH₂PO4 needed = 62.5 Submit X Incorrect; Try Again; 11 attempts remaining As a technician in a large pharmaceutical research firm, you need to produce 300. mL of a potassium dihydrogen phosphate buffer solution of pH = 7.02. The pK₂ of H₂PO4 is 7.21. You have the following supplies: 2.00 L of 1.00 M KH₂PO4 stock solution, 1.50 L of 1.00 M K₂HPO4 stock solution, and a carboy of pure distilled H₂O. How much 1.00 M KH₂PO4 will you need to make this solution? (Assume additive volumes.) Express your answer to three significant digits with the appropriate units. View Available Hint(s) Previous Answers Previous Answers X Incorrect; Try Again; 9 attempts remaining Submit μà 15 ΑΣΦ ΔΡΗ = |0.20 μA 3 Previous Answers A beaker with 1.30×102 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 7.50 mL of a 0.450 MHCI solution to the beaker. How much will the pH change? The pK, of acetic acid is 4.740. Express your answer numerically to two decimal places. Use a minus (-) sign if the pH has decreased. ► View Available Hint(s) Units mL ? ? לוטן וון צוועו~ |--

How many grams of dry NH4Cl need to be added to 2.50 L of a 0.200 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.74? Kb for ammonia is 1.8 x 10-5 Express your answer with the appropriate units. ► View Available Hint(s) mass of NH₂Cl = Value Submit Part A Volume of KH₂PO4 needed = 62.5 Submit X Incorrect; Try Again; 11 attempts remaining As a technician in a large pharmaceutical research firm, you need to produce 300. mL of a potassium dihydrogen phosphate buffer solution of pH = 7.02. The pK₂ of H₂PO4 is 7.21. You have the following supplies: 2.00 L of 1.00 M KH₂PO4 stock solution, 1.50 L of 1.00 M K₂HPO4 stock solution, and a carboy of pure distilled H₂O. How much 1.00 M KH₂PO4 will you need to make this solution? (Assume additive volumes.) Express your answer to three significant digits with the appropriate units. View Available Hint(s) Previous Answers Previous Answers X Incorrect; Try Again; 9 attempts remaining Submit μà 15 ΑΣΦ ΔΡΗ = |0.20 μA 3 Previous Answers A beaker with 1.30×102 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 7.50 mL of a 0.450 MHCI solution to the beaker. How much will the pH change? The pK, of acetic acid is 4.740. Express your answer numerically to two decimal places. Use a minus (-) sign if the pH has decreased. ► View Available Hint(s) Units mL ? ? לוטן וון צוועו~ |--

Chemistry
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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How many grams of dry NH4Cl need to be added to 2.50 L of a 0.200 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.74? K, for ammonia is 1.8 x 10-5 Express your answer with the appropriate units. ► View Available Hint(s) Submit mass of NH₂Cl = Value Part A Volume of KH₂PO4 needed = 62.5 Submit X Incorrect; Try Again; 11 attempts remaining As a technician in a large pharmaceutical research firm, you need to produce 300. mL of a potassium dihydrogen phosphate buffer solution of pH = 7.02. The pK₂ of H₂PO4 is 7.21. You have the following supplies: 2.00 L of 1.00 M KH₂PO4 stock solution, 1.50 L of 1.00 M K₂HPO4 stock solution, and a carboy of pure distilled H₂O. How much 1.00 M KH₂PO4 will you need to make this solution? (Assume additive volumes.) Express your answer to three significant digits with the appropriate units. ▸ View Available Hint(s) Previous Answers Previous Answers O Submit X Incorrect; Try Again; 9 attempts remaining 17 ΑΣΦ ΔΡΗ = |0.20 μà 3 μA Previous Answers A beaker with 1.30×102 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 7.50 mL of a 0.450 MHCI solution to the beaker. How much will the pH change? The pK, of acetic acid is 4.740. Express your answer numerically to two decimal places. Use a minus (-) sign if the pH has decreased. ► View Available Hint(s) Units mL ? ? לשטן לווין לווטו~~ | אור-
Transcribed Image Text:How many grams of dry NH4Cl need to be added to 2.50 L of a 0.200 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.74? K, for ammonia is 1.8 x 10-5 Express your answer with the appropriate units. ► View Available Hint(s) Submit mass of NH₂Cl = Value Part A Volume of KH₂PO4 needed = 62.5 Submit X Incorrect; Try Again; 11 attempts remaining As a technician in a large pharmaceutical research firm, you need to produce 300. mL of a potassium dihydrogen phosphate buffer solution of pH = 7.02. The pK₂ of H₂PO4 is 7.21. You have the following supplies: 2.00 L of 1.00 M KH₂PO4 stock solution, 1.50 L of 1.00 M K₂HPO4 stock solution, and a carboy of pure distilled H₂O. How much 1.00 M KH₂PO4 will you need to make this solution? (Assume additive volumes.) Express your answer to three significant digits with the appropriate units. ▸ View Available Hint(s) Previous Answers Previous Answers O Submit X Incorrect; Try Again; 9 attempts remaining 17 ΑΣΦ ΔΡΗ = |0.20 μà 3 μA Previous Answers A beaker with 1.30×102 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 7.50 mL of a 0.450 MHCI solution to the beaker. How much will the pH change? The pK, of acetic acid is 4.740. Express your answer numerically to two decimal places. Use a minus (-) sign if the pH has decreased. ► View Available Hint(s) Units mL ? ? לשטן לווין לווטו~~ | אור-
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