Prepared standard zinc solution,100 mg/L. Weighed 0.4514g of Zn(NO3)2•6 H2O into
ID: 1037265 • Letter: P
Question
Prepared standard zinc solution,100 mg/L. Weighed 0.4514g of Zn(NO3)2•6 H2O into 1 L vol flask.Use a-buret to deliver 0.00, 2.00, and 4.00, and-6.00-mL portions of the standa and mix zinc solution to individual 50-mL volumetric flask. Dilute to the-mark ai well.t PiBet 5.00mL of each these solutions to individual 50-mL volumetric flasks. Dilute toothe mark and mix well. Note: These are second dilutions concentrations will be used in the generation of the calibration curve whose Calculate Ap the ppm of the final solutions based on the actual ppm of the standard Zn (NO3) 2 6H20 and dilutions.
Explanation / Answer
Answer...
ppm stands for parts per million. It is used to measure chemical concentration. Solute concentration of 1 ppm is solute concentration of 1/1000000 of the solution. Formula for ppm is..
Concentration in ppm = 1000000 x mass of solute/mass of solution.
Therefore, for the first standard solution..
ppm = 1000000x100/1000 = 100000.
In the second solution..
ppm = 1000000x451.4/1000 =451400.
(since 0.4514 gm = 451 mg.)
ppm is a number with no unit.