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calculate the concentration of borate ion for a titration when 6.0998g borax is dissolved in 100mL of water and titrated with 25.5mL of HCl

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mols borax = grams/molar mass Na2B4O7*10H2O
mols borate ion = 2x that
M borate ion = mols/0.125L = ?

Here is a link that gives the titration details.
http://en.wikipedia.org/wiki/Borax

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