DETERMINATION OF SODIUM BY FLAME PHOTOMETRY - Computer Programming

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## Friday, April 1, 2011

DETERMINATION OF SODIUM BY FLAME PHOTOMETRY
Aim:
To determine the amount of sodium present in the given sample solution.
Principle:
Flame emission spectroscopy is a type of atomic emission spectroscopy. It is mostly applicable for analysis of alkali and alkali earth metals. In this spectroscopy, the sample solution of sodium salt is nebulized in to flame, which may produce solid residue upon solvent evaporation. This solid residue undergoes atomization and gives neutral atoms which may acquire thermal energy from flame and undergoes electronic excitation. Due to unstable nature of excited state, excited atoms come back to ground state by emission of absorbed energy as visible radiation. By measuring the wavelength and intensity of emitted radiation, we can do qualitative and quantitative analysis respectively.
Chemicals required:
1.      Sodium chloride
2.      Distilled water
Apparatus required:
1.      Flame photometer
3.      Pipette
Procedure:
Preparation of standard solutions for calibration curve:
Dissolve exactly 2.542gm of sodium chloride in water and make up to 1 liter. This contains 0.1mg per ml (1000) ppm. Dilute this to 10, 5, 2.5, and 1 ppm sodium ion solutions.
Estimation of sodium by flame photometer:
First, switch on the digital flame photometer followed by the air compressor with the required value (10 bar)
Open the gas from the gas cylinder (after the instrument is warmed up for 10 minutes). Initially allow the ion-free water (distilled water) to aspirate in to the flame and set the digital value as 100. Now the instrument is said to be calibrated. After this calibration of the instrument, no adjustment should be made .Introduce the solutions containing different concentrations of sodium chloride (2, 4, 6, 8, 10µg) to the flame and find out the intensity of emitted light of each solution.
Plot a calibration graph between concentration and intensity of NaCl solution which passes through the origin. Finally, introduce the sample of unknown solution containing sodium into the flame and find out the intensity of emitted radiation. From the intensity, the concentration of unknown solution can be determined.
Result:
The amount of sodium in the given sample………..ppm

Determination of sodium
 S. No Concentration of NaCl Solution(ppm) Flame intensity 1 10 2 8 3 6 4 4 5 2 6 unknown

The concentration of unknown sample =