10 mL of bleach with an unknown concentration is added to a100mL volumetric flask. The solution is then finished withdeionized water. 10 mL of this diluted bleach solution is thenadded to an erlenmeyer flask along with 1 scoop of KI, and 5 L of2M HCl. This solution is then titrated with Na2S2O3 until it is apale yellow color, then a starch indicator is added and titrationis completed until the solution is clear. If 43 mL of Na2S2O3 wasrequired, what is the percent of sodium hypochlorite in the bleach?How would it be calculated? A step by step answer would be verymuch appreciated.
NaOCL + 2HCl --> NaCl + H2O + Cl2
Cl2 + 2I- --> I2 +2Cl-
2S2O3^2- +I2 --> S4O6^2- +2I-
