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We are being asked the amount in milliliters of 0.10 M HCOOH and 0.10 M HCOONa to make one-liter of the buffer with pH 3.60.
HCOOH is a weak acid (and based on the Bronsted-Lowry definition, an acid is a proton (H+) donor. Once HCOOH loses its proton, its conjugate base is formed).
HCOOH(aq) + H2O(l) ⇌ HCOO-(aq) + H3O+(aq)
(weak acid) (base) (conjugate base) (conjugate acid)
You have to prepare a pH 3.60 buffer, and you have the following 0.10 M solutions available: HCOOH, CH3COOH, H3PO4, HCOONa, CH3COONa, and NaH2PO4.
How many milliliters of HCOOH and HCOONa would you use to make approximately a liter of the buffer?
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Based on our data, we think this problem is relevant for Professor Co's class at OSU.