Question 6 (2 points) A calibration curve has a least-squares equation Pe=1.50(ppm Ca2+). A 30.00-ml aliquot...
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.
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.
Question 4 (2 points) A working standard 1 is prepared by taking 24.00 mL of a 500.0 ppm stock solution and diluting it to a final volume of 360.0 mL. Working standard 2 is prepared by taking 3.00 mL of working standard 1 and diluting it to a final volume of 250.0 mL. Calculate the ppm concentration of the working standard 2. Provide your answer to three places after the decimal and without units. Your Answer: Answer Question 5 (2...