a. write an equation that shows how this buffer neutralixes small amountsof acid. b. write an equation that shows how this buffer neutralizes small amouts of base. c. calculate the ph of this buffer if it is 0.10 M CH3COOH and 0.10 M CH3COO - ; the Ka for CH3OOH is 1.08 x10^-5
2007-05-30 05:31:35 · 2 answers · asked by mweber126 1 in Science & Mathematics ➔ Chemistry
a. the effect of the added H+ would be to decrease the moles of CH3COO- and increase the moles of CH3COOH by the reaction :
H+ + CH3COO- >> CH3COOH
b. the effect of the added OH- is to covert CH3COOH to CH3COO- via the net reaction :
OH- + CH3COOH >> CH3COO- + H2O
c . we can use the equation
pH = pK + log [ CH3COO-] / [CH3COOH ]
Ka for CH3COOH is not 1.08 x 10^-5 but 1.8 x 10^-5
pKa = - log 1.8 x 10^-5 = 4.74
pH = 4.74 + log 0.1/ 0.1 = 4.74
2007-05-30 08:40:00 · answer #1 · answered by Anonymous · 1⤊ 0⤋
CH3COO- + H+ -> CH3COOH
pH = pKa = 4.96657624
2007-05-30 12:37:40 · answer #2 · answered by ag_iitkgp 7 · 0⤊ 0⤋