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EC number: 701-284-5
CAS number: 2137881-70-8
Potassium formate is expected to form the following equilibriums in aqueous solutions:
1) HCOOH-HCOOK <-->
HCOOH + HCOOK [equation 1]
HCOO- + H+ [equation 2]
HCOO- + K+ [equation 3]
Mapping the pH as function of dilution and titer curve allowed to estimate the buffer effect of the diformate system (equation 1)
and to calculate the concentration profile of diformate, formic acid and formate as function of concentration in water solutions.
The calculations indicate that in aqueous solutions
i) at pH <4 and at concentrations >0.1% the equilibrium in equation 1 is in favor of potassium diformate.
ii) at pH of 4 to 5, and at dilution down to 0.001%, most of the formic acid content is released from potassium formate.
iii) further dilution and increase of pH above 5, the concentrations of formic acid and diformate decrease rapidly, leaving only formate left at
pH 7 and above. No diformate exists above pH 7.
Formic acid is in equilibrium with its salts
in aqueous solutions. No diformate or formic acid exists above pH 7,
only formate is left.
The pKa for the dissociation of potassium
diformate into formic acid and potassium formate (equation 1) is approx.
The pKa for formic acid is approx. 3.75
+ H+ [equation
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