chemistry...
posted by mark .
thanks for the last help, i got the right answer!!
i got this wrong... (answer is supposed to be 0.165 but i put 0.0652)
A sample of Na2CO3 weighing 0.2863 g is dissolved in 50 mL of water and an endpoint is reached when 32.83 mL of HClO4 has been added. Calculate the molarity of the HClO4 solution.

chemistry... 
mark
ah please ignore, i got it!!
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