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June 30, 2015

Homework Help: Chemistry

Posted by Pavel on Sunday, September 20, 2009 at 2:05pm.

Hello, I need help with calculations for lab. I prepared excess NaOH and HCL solutions (unknown conc., ~0.1M). Then I standardized my NaOH solution by titrating known amounts of KHP (Potassium hydrogen phthalate)with it in the presence of phenolphthalein (indicator turns pink at pH 8.3). Then I titrate a known amount of my HCL solution (25.00 mL) with NaOH once again, also in the same indicator. How do I use this information to find out the concentration of both solutions.

In total I have given:
mass KHP and volume NaOH solution required to titrate to pH 8.3.

volume HCl and volume NaOH solution required to titrate to 8.3 pH

I need to find out the concentration of both solutions.

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