Choose the effective pH range of an aniline-anilinium chloride buffer. The value

Question

Choose the effective pH range of an aniline-anilinium chloride buffer. The value of the K-b for aniline is 4.3 Times 10^-10. 3.6-5.6 5.1-7.1 10.1-12.1 8.4-10.4 1.1-3.1 17. Choose the effective pH range of a pyridine-pyridinium chloride buffer. For pyridine, the value of k_b is 1.8 Times 10^-9. 4 3-6.3 7 7-9.7 10.3-12.3 1.4-3.4 9.1-11.1 A buffer contains equal concentrations of a weak acid, HA, and its conjuate base, A^-. If the value of K_a for HA is 1.0 Tfimes 10^-9, what is the pH of the buffer? 9.0 5.0 1.0 13.0 7.0 For NH_3, pK_b = 4.74. What is the pH of an aqueous buffer solution that is 0.050 M NH_3(aq) and 0.20 M NH_4Cl(aq)? 4.14 8.66 9.26 9.86 5.34 For HF, pK_a = 3.45. What is the pH of an aqueous buffer solution that is 0.100 M HF(aq) and 0.300 MKF(aq)? 11.03 2.97 3.93 10.07 3.45

Explanation / Answer

16.

if this is a buffer

then

pOH = pKb + log(conjugate/acid)

assume conjugate = acid are pretty similar so

pOH = pKb =

pOH = -loGKb ) = -log(4.3*10^-10) = 9.3665

pH = 14-9.3665 = 4.6335

conside A as a good option in the range of pH

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