Cay University of New York Lehman College Department of aenisary 15)What is the

Question

Cay University of New York Lehman College Department of aenisary 15)What is the ph of a buffer solution that is made using 100 ml of 0.4M ofHF and 100 mL of 08M NaF? a, 1.77 b, 2.85 C. 3.14 id. 3A4 e, 12.38 For questions 16-18 consider the polyprotic acid boric acid (6163 gmol) which has acidic protons (HsBo) and is often used as an antiseptic Chemical Formula R 40 x 10 16)Which of the following represent the secondacid dissociation for boric acid? 3B03 H20 at H30 17) What is the Ko value for the HB0s2species? a. 1.0 x 10-14 lb. 4.0x10-13 c, 1.7 x 10 s d. 2.5 x 10-2 e, 2.5 x 10-1 18What is the approximate ph of a 0.015 M H2Borl? a. 5.53 c 10,8 d. 12.9 e, 13.6 19)Consider the titration of 30 mL of0.06 Mpiperidine,a weak base with the formula CsH (in the flask) with MHClo.(in the buret).What is the overall chemical reaction that occurs during this titration? Fall 2016 Exam IA

Explanation / Answer

Q15.

for a buffer of HF and NaF:

apply Henderson hasselbach equation, which relate conjguate base + weak acid concentrations and the pKa of the buffer

pH = pKa + log(F-/HF)

so

we need pKA for HF

pKa = 3.14

so

pH = 3.14 + log(0.80/0.40)

pH = 3.441

best answer is D

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