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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: g5r on October 13, 2005, 05:20:48 PM

Title: volume titrate problem
Post by: g5r on October 13, 2005, 05:20:48 PM

what volume of .1M NaOH is needed to titrate 100ml of .2M H2SO4?

This is what i have so far...
     100ml H2SO4*(.1M NaOH/.2M H2SO4)= 50ml

the answer to the problem is 400ml. what am i doing wrong.
                       

Title: Re:volume titrate problem
Post by: mike on October 13, 2005, 06:16:06 PM

First you need to write the balanced equation for the reaction between sulfuric acid and sodium hydroxide.

Title: Re:volume titrate problem
Post by: Albert on October 16, 2005, 06:52:03 AM

[H2SO4]=0.2M V=100mL

H2SO4 + 2NaOH -> Na2SO4 + 2H2O

[NaOH]=0.1M V=xmL

Now, a little bit of calculations:

(2*0.2M*0.1L) / 0.1M =0.4L=400mL