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Buffer Lab. Need help fast!!!!

Question asked by Austin Stoner on Dec 17, 2014

In chemistry, we are doing a buffer lab. All we are given is a pH probe to test pH, 25 mL each of 3 unknown solutions with molarities between .1 and 1M, and 25 mL of both NaOH and HCl. We are supposed to determine a procedure to find out which of the unknown solutions are buffers. I realize buffers are supposed to have small pH changes when you add the HCl or NaOH, but how do I know how how much of each solution I should mix together to figure it out? We aren't allowed to use any more than the 25 mL of each that we have unless we lose points. Here is a picture of the lab. IMG_1396.jpeg