Lewis acids and bases

Define a Lewis acid as an electron-pair acceptor and a Lewis base as an electron-pair donor, apply the theory to inorganic reactions such as BF3 with NH3 and to organic reactions, and identify the Lewis acid and base in each.

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Zadanie 36Paper 1A, maj 2026
wzorowane1 pktzamkniętełatwe (szac.)

Which statement explains the Lewis acid-base nature of the carbocation in this reaction? CX2HX5X++IXCX2HX5I\ce{C2H5+ + I- -> C2H5I} A. Lewis base because it accepts a pair of electrons B. Lewis base because it donates a pair of electrons C. Lewis acid because it donates a…

Zadanie 3bPaper 2, maj 2025, TZ3
wzorowane4 pktobliczenioweśrednie (szac.)

(i) Outline the way in which ammonia behaves as a Lewis base during the formation of the complex ion [Ag(NHX3)X2]X+(aq)\ce{[Ag(NH3)2]+(aq)}. (ii) Determine the pH at 298 K of an aqueous ammonia solution of concentration 0.180 moldm3\mathrm{mol\,dm^{-3}}. Use section 1 of the data…

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