Problem- a 2 ml sample was taken of a saturated solution of barium iodate at 10 degrees C. The sample was mixed with 2 ml of 0.5 M KI and 2 ml of 1 M HCl. the transmittance of the mixture was read and compared to a calibration curve which indicated a concentration of I3- as 5.53*10-4 M calculate the following. a. the moles of I3- in the mixture. b. the moles of IO3- in the original sample. c. the concentration in moles/L of IO3- in the original sample. d. the concentration of Ba2+ (in M) in the original sample. e.the Ksp of barium iodate.

I just need a general explanation of it please- Thanks