35. The reaction of ammonia, NHs, and boron tri tnifluoride, as an acid-base rea

Question

35. The reaction of ammonia, NHs, and boron tri tnifluoride, as an acid-base reaction according BFs, can be classified to the acid/base definition of Lewis. Which statement best describes the reaction? (A) (B) (C) (D) NH, functions as the Lewis acid and will donate an electron pair to BF. NH, functions as the Lewis acid electron pair from BF NH, functions as the Lewis base and will donate an electron pair to BFi. NH; functions as the Lewis base and will accept an electron pair from BFs. and will accept an 36. Use the table below to determine which flask, at 25 C contains the most basic solution based on the information provided on the label. Flask BIC [OH] 0x10 M POH-7.I 79 10 M PH-42 (A) flask A (C) flask C (B) flask B (D) flask D 37. Which species is/are present in a 1.0 M solution of aqueous HF? (A) Only HF molecules (B) Only HF molecules and H:O molecules (C) Only HO ions, F ions, and H:0 molecules (D) HF molecules, H,O" ions, F ions, and H O molecules

Explanation / Answer

35. c) NH3 functions as the Lewis base and will donate an electron pair to BF3

A Lewis acid is a compound that accepts electrons and Lewis base is a compound that donate electrons. Here there is a lone pair of electrons on N in NH3 that it donates to BF3 and acts as a Lewis base.

36. a) flask A

pH = 14 - pOH

For B , pH = 14- 7.1 =6.9

pOH= -log[OH-] , for C, pOH = - log(7.9*10^-7) = 6.1

pH for C= 14.-6.1 =7.9

pH for A= -log (1*10^-9) =9

Greater the pH, more basic is the compound. Hence A is most basic

37. c) only H3O+ ions, F- ions and H2O molecules.

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