Lab 4 Section 4 Data Collection

For the table in section 4, how can we know K conc. in sample solution? There are no calculations for this and the data is not given. Are we supposed to guess it based on the spectrophotometer reading?

To obtain K concentration, you 1st need to construct standard solution curve by using info shown in table 6 on page 51 of your lab manual. Once you have constructed (drawn) the curve, you need to read of it conc. K from the curve that correspond to the spectrophotometer readings that were given to you in the lab.