If a propanoic acid/propanoate buffer is 0.035 M in propanoic acid and has a pH

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If a propanoic acid/propanoate buffer is 0.035 M in propanoic acid and has a pH of 4.59, what is the molar concentration of the propanoate ion? The pKa of propanoic acid is 4.89.

Carboxylic acids are weak acids and dissociate in aqueous solution to the RCOOH(aq) rightarrow RCOO-(aq) + H+(aq) The extent of dissociation is given by the equilibrium dissociation constant, Ka, which is often expressed in its logarithmic form as pKa. (The cation is written simply as H+ and is understood to be solvated with one or more water molecules in solution.) K1 = [h+][RCOO-] / [RCOOH] pkn = -log(Ka) If a propanoic acid/propanoate buffer is 0.035 M in propanoic acid and has a pH of 4.59, what is the molar concentration of the propanoate ion? The pKa of propanoic acid is 4.89. [CH3 CH2 COO-] =

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