Potash alum, KAl(SO4)2·12H2O, is a double salt. When dissolved in water, it undergoes hydrolysis. Because it is derived from a strong acid (sulfuric acid) and a weak base (aluminum hydroxide), the resulting aqueous solution is acidic, not basic. Therefore, the statement claiming it is basic is incorrect.
3882
Which of the following properties characterizes a base?
Bases are defined by multiple theories: they taste bitter (general property), release hydroxide ions in water (Arrhenius theory), and can act as electron pair donors (Lewis theory). Therefore, all the listed options correctly describe the properties of various types of bases.
3883
Which of the following species does not function as a Lewis acid?
A Lewis acid is defined as an electron-pair acceptor. AlCl3, BF3, and FeCl3 all have incomplete octets or vacant orbitals allowing them to accept electron pairs. Ammonia (NH3), however, possesses a lone pair of electrons on the nitrogen atom, which allows it to act as a Lewis base by donating that electron pair.
3884
Identify which of the following species does not function as a Lewis acid.
A Lewis acid is defined as an electron-pair acceptor. AlCl3, BF3, and FeCl3 possess incomplete octets or vacant d-orbitals, allowing them to accept electron pairs. Conversely, ammonia (NH3) has a lone pair of electrons on the nitrogen atom, which it can donate, making it a Lewis base rather than a Lewis acid.
3885
What term describes metal oxides that possess the ability to react with both acidic and basic substances?
Amphoteric oxides are compounds that can act as either an acid or a base depending on the environment. They react with acids to form salts and water, and they also react with strong bases to form complex salts. Common examples include aluminum oxide (Al2O3) and zinc oxide (ZnO).
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3887
What does Clemmensens reduction involve the reduction of?
Clemmensens reduction is a chemical process involving the reduction of carbonyl compounds, specifically ketones. It is a common synthetic tool in organic chemistry to form carbon-carbon bonds by reducing carbonyl groups. The process typically involves a reductant like lithium aluminum hydride (LiAlH4) or sodium borohydride (NaBH4) and a Lewis acid like aluminum chloride (AlCl3) or ferric chloride (FeCl3) as a catalyst.
3888
Identify the species that does not act as an electrophile.
Electrophiles are electron-seeking species. NH3 (ammonia) is a Lewis base, meaning it donates electrons, not accepts them. Br+, H+, and BF3 are all positively charged or electron-deficient, making them electrophiles.
3889
Which of the following compounds is an acid with a basicity of one?
Basicity of an acid refers to the number of replaceable hydrogen ions per molecule. Sodium dihydrogen phosphate (NaH2PO4) can release one proton in a neutralization reaction, making it a monobasic acid in that context, whereas phosphoric acid (H3PO4) is tribasic.
3890
In the reaction between the hydrogen sulfate ion and water (HSO4- + H2O -> H3O+ + SO4^2-), what is the role of water?
According to the Bronsted-Lowry theory, a base is a proton acceptor. In this reaction, water accepts a proton (H+) from the hydrogen sulfate ion to form the hydronium ion (H3O+). Since water accepts a proton, it acts as a Bronsted-Lowry base in this specific chemical transformation.
