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April 23, 2014

Homework Help: Chemistry

Posted by Ellen on Wednesday, March 28, 2012 at 5:30am.

The formaldehyde content of a pesticide preparation was determined by weighing 0.3124g of the liquid sample into a flask containing 50.0mL of 0.0996M NaOH and 50mL of 3% H2O2. Upon heating, the following reaction took place:

OH- + HCHO + H2O2 -> HCOO- + 2H2O

After cooling, the excess base was titrated with 23.3mL of 0.05250M H2SO4. Calculate the percentage of HCHO (30.026g/mol) in the sample.

Please explain throughly step by step on how to do this question. Thanks.

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