【Daily Question】Chemical Analysis Edition, 2019.9.29
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This post was last edited by zjp on 2019-9-29 07:37. Multiple-choice question: (C) 7. To prepare 1 liter of HAc-NaAc buffer solution with a pH of 5.0 using NaAc•3H2O crystals and 2.0 mol/L NaOH, the correct method is 1 (A) Dissolve 49 grams of NaAc•3H2O in a small amount of water, then add 50 ml of 2.0 mol/L HAc solution, and dilute to 1 liter with water. (B) Dissolve 98 grams of NaAc•3H2O in a small amount of water, then add 50 ml of 2.0 mol/L HAc solution, and dilute to 1 liter with water. (C) Dissolve 25 grams of NaAc•3H2O in a small amount of water, then add 100 ml of 2.0 mol/L HAc solution, and dilute to 1 liter with water. (D) Dissolve 49 grams of NaAc•3H2O in a small amount of water, then add 100 ml of 2.0 mol/L HAc solution, and dilute to 1 liter with water. C
7. To prepare 1 liter of HAc-NaAc buffer solution with a pH of 5.0 using NaAc•3H2O crystals and 2.0 mol/L NaOH, the correct method is (C). (A) Dissolve 49 grams of NaAc•3H2O in a small amount of water, then add 50 ml of 2.0 mol/L HAc solution, and dilute to 1 liter with water. (B) Dissolve 98 grams of NaAc•3H2O in a small amount of water, then add 50 ml of 2.0 mol/L HAc solution, and dilute to 1 liter with water. (C) Dissolve 25 grams of NaAc•3H2O in a small amount of water, then add 100 ml of 2.0 mol/L HAc solution, and dilute to 1 liter with water. (D) Dissolve 49 grams of NaAc•3H2O in a small amount of water, then add 100 ml of 2.0 mol/L HAc solution, and dilute to 1 liter with water
(C) Dissolve 25 grams of NaAc•3H2O in a small amount of water, then add 100 ml of 2.0 mol/L HAc solution, and dilute to 1 liter with water