a dilute bleach solution that is 5 percent by volume is prepared by mixing a por

Question

a dilute bleach solution that is 5 percent by volume is prepared by mixing a portion of liquid bleach with DI water.

a 25.00 ml sample of this bleach solution is analyzed. it is found that 24.32 ml of a 0.167 M solution of NA2S2O3 is needed to reach the stoichmetric endpoint of the titration. calculate the number of moles s2o3^2- used for the titration.

equations:

cl2+2naoh-->NaClO + h2o + nacl

ClO + 2I + h2o --> i2 + cl + 2OH

I2 + I --> I3

I3 +2s2O3 --> 3I + S4O6

how am i even suppose to start this problem?

answer in step by step method plz

Explanation / Answer

Moles of S2O32- used for titration=moles of Na2S2O3 added

Moles of Na2S2O3 added=molarity of solution*volume in ltr=0.167*24.32/1000=4.06144*10-3 mol

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