termination of Sodium and Potassium Amounts by Flame Phot Pre-lab Worksheet: Det
ID: 862175 • Letter: T
Question
termination of Sodium and Potassium Amounts by Flame Phot Pre-lab Worksheet: Determination of Sodium Photomety attach Read the experiment, and then answer the following questions s Calculate the masses of NaCi and KCI that are required to additional pages as needed the following questions. Show all calculations; at as needed 1. to prepare 250.0 mL of a standard that contains Na and K, each present at 1000 ppm w at 1000 g rn ured o prepure 250.0 ml ofa standard 2. Calculate the amount (mL) of 1000 pom wy Na/K needed to prepare w/v Na/K. n000 ppm w/v NaK needed to prepare 250 mL of 100 ppm 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 w/v Na and K 4. Calculate the Na and K' concentrations if you used 0.8500 g of aCiand b3955 oK 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? Briefly explain the theory behind how flame behind how flame photometry is used to measure Na and K 5. If a river water sample containing several di through the flame photomete, hoaw being measured and not any other metal, be certain that different metals at varying concentrations is put e containcan we be certain thst only one element, such as Na, is 6.Explanation / Answer
stock solution = 100ppm
solution needed 100mL of
we can calculate mL of solution needed for each of the desired conc as
1. 1ppm
M1V1 = M2V2
1 X 100 = 100 X V2
V2 = 1mL
2.2ppm
M1V1 = M2V2
2 X 100 = 100 X V2
V2 = 2mL
3.3ppm
M1V1 = M2V2
3 X 100 = 100 X V2
V2 = 3mL
4.4ppm
M1V1 = M2V2
4 X 100 = 100 X V2
V2 = 4mL
5. 5ppm
M1V1 = M2V2
5 X 100 = 100 X V2
V2 = 5mL respectively
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