The reason for greater emission intensity of sodium lines at 589 and 589.6 nm for a solution containing KCl in comparison to the solution in which KCl is absent should be determined. Concept introduction: Spectral lines are lines which help in identifying the atoms and molecules. These are a result of absorption or emission of light in a comparatively narrower frequency range compared to the frequencies nearby. Sodium spectrum has bright doublet at 588.995 and 589.592 nm. This is said to be sodium D-lines. The intensity of the line at 589 nanometers is twice that of the intensity of the line at 589.6 nanometers.

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Part 3: AHm,system Mass of 1.00 M HCI Vol. of 1.00 M HCI Mass of NaOH(s) Total Mass in Calorimeter Mole product if HCI limiting reactant Trial 1 62.4009 1.511g Mole product if NaOH limiting reactant Limiting reactant Initial Temperature Final Temperature 23.8°C 37.6°C Change in Temperature AHm,system (calculated) Average AHm,system (calculated) (calculated) (calculated) Trial 2 64.006g 1.9599 (calculated) (calculated) (calculated) (calculated) (calculated) (calculated) 24.7°C 41.9°C (calculated) (calculated) (2 pts. each)

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Chapter 8, Problem 8.5QAP

Interpretation Introduction

Interpretation:

The reason for greater emission intensity of sodium lines at 589 and 589.6 nm for a solution containing KCl in comparison to the solution in which KCl is absent should be determined.

Concept introduction:

Spectral lines are lines which help in identifying the atoms and molecules. These are a result of absorption or emission of light in a comparatively narrower frequency range compared to the frequencies nearby.

Sodium spectrum has bright doublet at 588.995 and 589.592 nm. This is said to be sodium D-lines. The intensity of the line at 589 nanometers is twice that of the intensity of the line at 589.6 nanometers.

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Part 3: AHm,system Mass of 1.00 M HCI Vol. of 1.00 M HCI Mass of NaOH(s) Total Mass in Calorimeter Mole product if HCI limiting reactant Trial 1 62.4009 1.511g Mole product if NaOH limiting reactant Limiting reactant Initial Temperature Final Temperature 23.8°C 37.6°C Change in Temperature AHm,system (calculated) Average AHm,system (calculated) (calculated) (calculated) Trial 2 64.006g 1.9599 (calculated) (calculated) (calculated) (calculated) (calculated) (calculated) 24.7°C 41.9°C (calculated) (calculated) (2 pts. each)

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