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1- Which statement is not a good practice during weighing in Chemicals should never be placed directly on the weighing pan. Close the glass door of the balance before reading. X Hot samples can be weighted on the balance at any temperature. Use tissue paper to place objects on the balance. u chould nerform?

1- Which statement is not a good practice during weighing in Chemicals should never be placed directly on the weighing pan. Close the glass door of the balance before reading. X Hot samples can be weighted on the balance at any temperature. Use tissue paper to place objects on the balance. u chould nerform?

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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**Educational Website Content: Analytical Chemistry Practice Questions** --- ### Practice Questions on Analytical Chemistry 1. **Which statement is not a 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._ 2. **Before using a clean 25 mL pipet in an experiment, what operation should you perform?** - _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._ 3. **Knowing what you know about 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._ 4. **After a gravimetric determination of Ca, the following weighted masses of Ca were recorded: 0.123; 0.125; 0.121; 0.122; 0.116 and 0.123 g.** - _What was the standard deviation of these measurements?_ - _Identify the outlier using the Grub's test. Use Q = 0.05._ - _What is the new confidence interval? Use α = 0.05._ 5. **0.41 g of KHP (primary standard) was transferred to a 100 mL (±0.07) volumetric flask to obtain a 0.02 M KHP solution using both analytical and technical balances. The molar mass of KHP is 204.22 g/mol, and has negligible uncertainty relative to other uncertainties in this problem. C = m/MV.** - _What is the propagated error in the KHP concentration when the analytical balance (±0.0001) is used to weigh the solid?_ - _What is the propagated error in the KHP concentration when the technical balance
Transcribed Image Text:**Educational Website Content: Analytical Chemistry Practice Questions** --- ### Practice Questions on Analytical Chemistry 1. **Which statement is not a 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._ 2. **Before using a clean 25 mL pipet in an experiment, what operation should you perform?** - _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._ 3. **Knowing what you know about 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._ 4. **After a gravimetric determination of Ca, the following weighted masses of Ca were recorded: 0.123; 0.125; 0.121; 0.122; 0.116 and 0.123 g.** - _What was the standard deviation of these measurements?_ - _Identify the outlier using the Grub's test. Use Q = 0.05._ - _What is the new confidence interval? Use α = 0.05._ 5. **0.41 g of KHP (primary standard) was transferred to a 100 mL (±0.07) volumetric flask to obtain a 0.02 M KHP solution using both analytical and technical balances. The molar mass of KHP is 204.22 g/mol, and has negligible uncertainty relative to other uncertainties in this problem. C = m/MV.** - _What is the propagated error in the KHP concentration when the analytical balance (±0.0001) is used to weigh the solid?_ - _What is the propagated error in the KHP concentration when the technical balance
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