Homework Help: Chemistry

Posted by coug on Monday, January 4, 2010 at 1:22pm.

A 25.00-mL sample of an H2SO4 (2 and 4 are subscripted) solution of unknown concentration is titrated with a .1328 M KOH solution. A volume of 38.33 mL of KOH was required to reach the endpoint. What is the concentration of the unknown H2SO4 (again, the 2 and 4 are subscripted) solution?

my work:
38.33 mL KOH* (1L/1000mL)*(.1328 M KOH/L KOH)*(1 mol H2SO4/1mol KOH)=.005090 mol H2SO4

M= mol solution/L= .005090mol/.025L
=.2036M

However, the answer in the book says it should equal .1018M. I'm confused.

Chemistry - DrBob222, Monday, January 4, 2010 at 4:21pm
Answered above. If you balance the equation you will find it takes 2 KOH for 1 mole H2SO4.

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