The strongest acid among the following is :
[SbF6]–H2F+
Very strong acids are compared by the Hammett acidity function \(H_{0}\) (more negative = stronger), since in water they are all levelled to H3O+. An acid stronger than 100% sulfuric acid (\(H_{0} \approx -12\)) is called a superacid.
Mixing HF with the strong Lewis acid SbF5 gives fluoroantimonic acid: \(2HF + SbF_{5} \rightarrow H_{2}F^{+} + SbF_{6}^{-}\). The SbF6– anion is an extremely weak, non-nucleophilic base with its charge spread over six fluorine atoms, so the H2F+ cation is an extraordinarily strong proton donor.
The \(H_{0}\) of HF–SbF5 mixtures reaches roughly –21 to –28, many orders of magnitude beyond 100% H2SO4.
HNO3 is weaker than H2SO4, and HI, though the strongest hydrohalic acid (aqueous pKa about –10), is far weaker than a superacid.
Therefore fluoroantimonic acid is the strongest acid in the list.
Hence, [SbF6]–H2F+.
Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
