I I termination of Sodium and Potassium Amounts by Flame Photometry lI Pre-lab W
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I I termination of Sodium and Potassium Amounts by Flame Photometry lI Pre-lab Worksheet: Determination of Sodium um and Potassium Read the experiment, and then answer the following questions additional pages as needed questions. Show all calculations; atoch 1, Calculate the masses of Naci and KCl that are required to that contains Na and K, each present at 1000 ppm ww to prepare 250.0 mL of a standard at 1000 germ uiyed o prepare 250.0 ml of a standard w/v Narne the amount (ml)ot 1000pm ww NaK nedel to prepare 250 mil of 100 ppm wiv Na/k. 2. Calculate the amount (mL) of 1000 ppm w/v Na/K 3. Calculate how many ml of 100 ppm wiv Na/K are needed to prepare 100 ml each of standards containing 1,2, 3,4 and 5 ppm wiv Na and K 4. Calculate the Na and K' concentrations if you used 0.8500 g of aCfand 03959 of K g o instead of the values you calculated in Question 1, to prepare 250 mL of solution. What the would be the concentrations of the diluted solutions in Questions 2 and 3? behind how flame photometry is used to measure Na, and K 5. Briefly explain the theory behind how flame If a river water sample containing several through the flame photometer, howw being measured and not any other metal, everal diflferent metals at varying concentrations is put containingan we be certain that only one element, such as Na, is 6. certain that only ngExplanation / Answer
flame photometry is based upon the principle that an alkali metal salt placed into a non-luminous flame will ionise and absorb a specific wavelength or energy from the flame and then emit light of a particular or characteristic wavelength. The light is emitted as the excited atoms decay to the unexcited ground state ( more stable). The intensity of emission is proportional to the concentration of the element in the solution.
NaCl gives yellow colour and KCl magenta purplish colour
6. Since Na+ and K+ emit light of different wavelengths (colours), by using appropriate coloured filters the emission due to Na+ and K+ can be specifically measured in the same sample
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