Page 1Background - ReviewReview: Two pages highlight the importance of planning before calculating and introduce strategies to deal with stoichiometry problems where the unknown and unknown appear in different, but linked, chemical reactions.
25 marksPage 3Problem 1Problem:Titration of the iodine produced by reaction of 25.00 mL of 0.01869 mol L–1 KIO3 requires 27.28 mL of the Na2S2O3 solution to reach the end point. Calculate the concentration of the sodium thiosulfate.
Page 4Problem 2 - ReviewCalculate the concentration in mol L–1 of NaOCl in the commercial bleach if a 10.00 mL sample is diluted to 100.0 mL. 25.00 mL of the diluted bleach is treated as described above. 13.57 mL of 0.1116 mol L–1 sodium thiosulfate is required to reach the endpoint in the titration.