A buffer solution contains 0.59 mol of ascorbic acid (HC6H7O6) and 0.30 mol of sodium ascorbate (NaC6H7O6) in 3.70 L. The Ka of ascorbic acid (HC6H7O6) is Ka = 8e-05.
(a) What is the pH of this buffer? pH =
(b) What is the pH of the buffer after the addition of 0.28 mol of NaOH? (assume no volume change) pH =
(c) What is the pH of the original buffer after the addition of 0.11 mol of HI? (assume no volume change) pH =
A) it is acidic buffer
pKa = 4.10
pH = pKa + log(Salt/acid)
=4.10+log(0.30/0.59)
pH = 3.80
B) if we add NaOH it reacts with Acid
So, acid remains = 0.59-0.28 = 0.31 mol
Mole of salt formed = 0.30+.28 =0.58 mol
pH = 4.10 + log(0.58/0.31)
=> 4.37
C) if we add HI, it reacts with conjugate base
So acid formed = 0.11 + 0. 59 = 0.70 mol
Conjugate base remains= 0.30-0.11=> 0.19 mol
pH = 4.10+(0.19/0.70)
=> 3.53
A buffer solution contains 0.59 mol of ascorbic acid (HC6H7O6) and 0.30 mol of sodium ascorbate (NaC6H7O6) in 3.70 L. Th...
A buffer solution contains 0.64 mol of hydrocyanic acid (HCN) and 0.59 mol of sodium cyanide (NaCN) in 5.10 L. The Ka of hydrocyanic acid (HCN) is Ka = 4.9e-10. (a) What is the pH of this buffer? pH = 9.345 (b) What is the pH of the buffer after the addition of 0.44 mol of NaOH? (assume no volume change) pH = (c) What is the pH of the original buffer after the addition of 0.25 mol of HI?...
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26. + -/0.1 points 0/4 Submissions Used A buffer solution contains 0.45 mol of benzoic acid (HC7H502) and 0.33 mol of sodium benzoate (NaCzH502) in 3.70 L. The Ka of benzoic acid (HC7H502) is Ka = 6.30-05. (a) What is the pH of this buffer? pH = (b) What is the pH of the buffer after the addition of 0.31 mol of NaOH? (assume no volume change) pH = (c) What is the pH of the original buffer after the...
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