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1. What is the purpose of rinsing the buret and pipette prior to their use? What kind of errors might be added if this rinsing is not carried out?

1. What is the purpose of rinsing the buret and pipette prior to their use? What kind of errors might be added if this rinsing is not carried out?

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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Name. EXPERIMENT 11 DETERMINATION OF MOLAR SOLUBILITY 1. 2. For this titration: a. Date What is the purpose of rinsing the buret and pipette prior to their use? What kind of errors might be added if this rinsing is not carried out? What is the indicator to be used? Pre-Laboratory Questions. b. What color change is expected at the end point? Instructor C. c. Phenolphthalein has a color change over the pH range of 8.2-10; methyl orange has a color change over the pH range of 3.2-4.4. Why would phenolphthalein be less acceptable as an indicator for this experiment? 3. A titration is performed with a 25.00 mL analyte saturated solution of manganese(II) hydroxide with methyl orange indicator, titrated with 0.0045 M HCl. The end point was reached after 8.72 mL of HCl was added. What is the molar concentration of OH in the saturated solution? b. Calculate K for the manganese hydroxide. (Eq. 2) What is the molar solubility of the manganese hydroxide? (Eq. 3) DETERMINATION OF MOLAR SOLUBILITY 127
Transcribed Image Text:Name. EXPERIMENT 11 DETERMINATION OF MOLAR SOLUBILITY 1. 2. For this titration: a. Date What is the purpose of rinsing the buret and pipette prior to their use? What kind of errors might be added if this rinsing is not carried out? What is the indicator to be used? Pre-Laboratory Questions. b. What color change is expected at the end point? Instructor C. c. Phenolphthalein has a color change over the pH range of 8.2-10; methyl orange has a color change over the pH range of 3.2-4.4. Why would phenolphthalein be less acceptable as an indicator for this experiment? 3. A titration is performed with a 25.00 mL analyte saturated solution of manganese(II) hydroxide with methyl orange indicator, titrated with 0.0045 M HCl. The end point was reached after 8.72 mL of HCl was added. What is the molar concentration of OH in the saturated solution? b. Calculate K for the manganese hydroxide. (Eq. 2) What is the molar solubility of the manganese hydroxide? (Eq. 3) DETERMINATION OF MOLAR SOLUBILITY 127
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