23. A water sample of unknown salinity was tested using Kit A. The concentrations, in mg/L, of selected compounds in this sample were: dissolved O2 = 7.1, CaCO3 = 69.0, and NH3 = 0.65. According to the data in the table, one would predict that the most likely level of salinity was:
Answer and Explanation
Your Answer is
Correct Answer is B
Explanation
There is a trend in the horizontal comparison of a substance in the table. The O2 concentration in the sample is 7.1, which is between 7.3 and 6.9 obtained with KitA at 0ppt and 5ppt. For the remaining two substances CaCO3 and NH3, the values obtained from the samples are all measured by KitA between 0ppt and 5ppt, so it is basically certain that the sample salinity is between 0 and 5