EXERCISE 9.9: In the analysis of sea water for gold content, a series of calibration standards were prepared using 4% HCl in deionized water as the diluent and then measured using ICP-AES after setting the response to zero with neat 4% HCl. A 10.00mL aliquot of the sea water was acidified by adding 1.25mL of concentrated (36.0%)HCl and then measured using the same method, yielding a response of 1,433 (arbitrary units). (a) What was the percentage of HCl in the treated sea water sample? (b) Calculate the concentration of the gold in the original sea water sample. (c) Calculate the standard deviation of the calculated concentration. (d) Determine the 95% confidence interval for the measurement. (e) Do you see any potential problems with this method as described? Explain. What would you do differently? (f) Would your response to (e) be different if the method used were flame AAS? Explain