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X None of the above. molur mass 04) (Cao) 6- 0.5345 g of an unknow sample containing Ca2* was mixed with 25 mL of a 0.32 M precipitate of Ca2C204. Calculate the % Ca2 in the sample, expressed as % CaO. The molar masses of CaC2O4 and CaO are 128.10 g/mol and 56.08 g/mol, respectively. (4 Consider that only the Ca2" present in the sample reacts with (NH4)2C2O4. 0.3 1.4 1.2 0:32 M

X None of the above. molur mass 04) (Cao) 6- 0.5345 g of an unknow sample containing Ca2* was mixed with 25 mL of a 0.32 M precipitate of Ca2C204. Calculate the % Ca2 in the sample, expressed as % CaO. The molar masses of CaC2O4 and CaO are 128.10 g/mol and 56.08 g/mol, respectively. (4 Consider that only the Ca2" present in the sample reacts with (NH4)2C2O4. 0.3 1.4 1.2 0:32 M

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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## Analytical Chemistry Exercise Key Concepts and Problem Solutions ### Question 1: Analytical Balance Practices **Which statement is not good practice during weighing in an analytical balance?** - Chemicals should never be placed directly on the weighing pan. ✗ - Close the glass door of the balance before reading. ✓ - Hot samples can be weighed on the balance at any temperature. ✗ - Use tissue paper to place objects on the balance. ✓ ### Question 2: Pipet Preparation **Before using a clean 25 mL pipet in an experiment, what operation should be performed?** - Calibrate the pipette with D.I. water using an analytical balance for weighing. - Clean the pipette again and start using it. ✗ - Calibrate the pipette with an acid solution of unknown density. - Calibrate the pipette with D.I. water using a technical balance for weighing. ### Question 3: Systematic and Random Errors **Which error source is not a “correctable” source of error in a volumetric titration?** - Overshooting the end point. - Having air bubbles in the buret tip. - Using an uncalibrated buret. - Reading the burette scale repeatedly. ✗ ### Question 4: Gravimetric Determination of Calcium **Determination and Outlier Identification:** - **Given Masses (g):** 0.123; 0.125; 0.121; 0.122; 0.116 and 0.123 g. - **Standard Deviation Calculation:** Provided formulas and step-by-step calculations. - **Outlier Identification:** Using Grubbs’ test, Q = 0.05. **Confidence Interval & Error Propagation:** - **Incremented Confidence Interval:** Calculated with a confidence level of 95% (0.05). - **Example formulas and calculations for propagation of error in KHP concentration.** ### Question 5: Analytical vs Technical Balance **Why use an analytical balance to prepare the KHP solution instead of a technical one?** - The analytical balance allows weighing higher amounts precisely. - The technical balance is non-useful. - Using the analytical balance lowers the propagated error in KHP concentration. ✗ - None of the above. ### Calcium Oxalate (CaC2O4) Experiment **Experimental Procedure:** - **Sample Analysis:** 0.534
Transcribed Image Text:## Analytical Chemistry Exercise Key Concepts and Problem Solutions ### Question 1: Analytical Balance Practices **Which statement is not good practice during weighing in an analytical balance?** - Chemicals should never be placed directly on the weighing pan. ✗ - Close the glass door of the balance before reading. ✓ - Hot samples can be weighed on the balance at any temperature. ✗ - Use tissue paper to place objects on the balance. ✓ ### Question 2: Pipet Preparation **Before using a clean 25 mL pipet in an experiment, what operation should be performed?** - Calibrate the pipette with D.I. water using an analytical balance for weighing. - Clean the pipette again and start using it. ✗ - Calibrate the pipette with an acid solution of unknown density. - Calibrate the pipette with D.I. water using a technical balance for weighing. ### Question 3: Systematic and Random Errors **Which error source is not a “correctable” source of error in a volumetric titration?** - Overshooting the end point. - Having air bubbles in the buret tip. - Using an uncalibrated buret. - Reading the burette scale repeatedly. ✗ ### Question 4: Gravimetric Determination of Calcium **Determination and Outlier Identification:** - **Given Masses (g):** 0.123; 0.125; 0.121; 0.122; 0.116 and 0.123 g. - **Standard Deviation Calculation:** Provided formulas and step-by-step calculations. - **Outlier Identification:** Using Grubbs’ test, Q = 0.05. **Confidence Interval & Error Propagation:** - **Incremented Confidence Interval:** Calculated with a confidence level of 95% (0.05). - **Example formulas and calculations for propagation of error in KHP concentration.** ### Question 5: Analytical vs Technical Balance **Why use an analytical balance to prepare the KHP solution instead of a technical one?** - The analytical balance allows weighing higher amounts precisely. - The technical balance is non-useful. - Using the analytical balance lowers the propagated error in KHP concentration. ✗ - None of the above. ### Calcium Oxalate (CaC2O4) Experiment **Experimental Procedure:** - **Sample Analysis:** 0.534
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