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April 20, 2014

Homework Help: Analytical chemistry

Posted by Gloria on Tuesday, July 30, 2013 at 8:55am.

A 25 ml sample of household bleach was diluted to 500 ml in a volumetric flask. An unmeasured excess of potassium iodide was aded to a 20 ml aliquot of the diluted sample; the iodine liberated in the reaction: OCl- + 2I- -> I2 + Cl- + H2O
required 34.5 ml of 0.0409 M Na2S2O3. Calculate the weight- volume precentage of NaOCl in the sample.

i just get stuck in the middle of the problem :S

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