1. A calibration curve has a least-squares equation Pe=1.61(ppm Ca2+). A 29.42-mL aliquot of an unknown water sample labelled hard - very hard was diluted to a total volume 297.2 mL and then analyzed by flame photometry. The emitted power was measured to be 29.9. What is the hardness of the original water sample in ppm CaCO3?
Report answer without any decimal places. Do not enter units.
1. A calibration curve has a least-squares equation Pe=1.61(ppm Ca2+). A 29.42-mL aliquot of an unknown...
Question 6 (2 points) A calibration curve has a least-squares equation Pe=1.50(ppm Ca2+). A 30.00-ml aliquot of an unknown water sample labelled hard - very hard was diluted to a total volume 400.0 mL and then analyzed by flame photometry. The emitted power was measured to be 28.6. What is the hardness of the original water sample in ppm CaCO3 Report your answer without any decimal places. Do not enter units. Your Answer: Answer
2. A calibration curve has a least-squares equation Pe=1.48(ppm Ca2+). A neat water sample was analyzed by flame photometry. The Emitted Power was measured to be 14.4. What is the hardness of the water sample in ppm CaCO3? Report answer to one decimal places. Do not enter units.
1. A calibration curve has a least-squares equation Pe=1.38(ppm Ca2+). A neat (undiluted) water sample was analyzed by flame photometry. The Emitted Power was measured to be 22.3. What is the ppm Ca2+ in the water? Report answer to one decimal places. Do not enter units.
please show all calculations and formulas
1. The following calibration plot was generated for you: Calibration of Calcium Concentration by AA Absorbance Value at 422.7 nm y = 0.00937x + 0.01323 RP = 0.99844 10 50 60 20 30 40 Calcium Concentration (ppm) Prior to running your sample on the AA instrument, you diluted your sample 1:1 with distilled water. You measured the calcium absorbance to be 0.2955. a) What is the concentration of calcium (in ppm) of your original...
1. A 10.00 mL aliquot of 0.010 M CaCO3 is titrated with 18.22 mL of EDTA solution. What is the EDTA molarity? 2. A 250.0 mL water sample requires 30.85 mL of the EDTA solution from question 1 to reach the calmagite endpoint. What was the molarity of the hard metal ions in the water sample? 3. If the metal ions in the water sample of question 2 are assumed to be Ca2+ from CaCO3, express the concentration in ppm...
Name Section Experiment 28 Advance Study Assignment: Determination of the Hardness of Water 1. A 0.3946 g sample of Caco, is dissolved in 12 M HCl and the resulting solution is diluted to 250.0 mL in a volumetric flask. a. How many moles of Caco, are used (formula mass = 100.1)? moles b. What is the molarity of the Ca2+ in the 250 mL of solution? c. How many moles of Caare in a 25.00-mL aliquot of the solution in...