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The pKa of acetic acid, HC2H3O2, is 4.76. A buffer solution was made using an unspecified amount ....?
The pKa of acetic acid, HC2H3O2, is 4.76. A buffer solution was made using an unspecified amount of acetic acid and 0.30 mol of NaC2H3O2 in enough water to make 2.00 L of solution. Its pH was measured as 4.40. How many moles of HC2H3O2 were used?
A. 0.13 mol
B. 0.69 mol
C. 1.37 mol
D. 0.60 mol
E. 0.18 mol
2 Answers
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- Dr.ALv 71 decade agoFavorite Answer
4.40 - 4.76=- 0.36
10^-0.36=0.437 = 0.15/x
x = 0.344 M
moles acid = 0.344 x 2 = 0.69
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