Results 201 to 210 of about 5,932,066 (253)
Some of the next articles are maybe not open access.
Acid Catalysis by Heteropoly Acids
ChemInform, 2003The achievements in the field of acid catalysis by heteropoly acids having different structures HxPW11LO40 (L = ZrIV, TiIV, ThIV), HxZW12O40 (Z = SiIV, PV, BIII, CoIII, GeIV), H21B3W39O132, H6P2W18O62, H6P2W21O71, H6As2W21O69 are reviewed. The data on the acidity of HPAs are generalized. The rules of homogeneous and heterogeneous acid catalysis by HPAs
openaire +1 more source
The Acidity of Tetraphosphoric Acid
Inorganic Chemistry, 1963Two hydrogen ions in linear tetraphosphoric acid are essentially quantitatively dissociated. With the ionic strength adjusted to unity with tetramethylammonium chloride, a t 25”, the pK values of the remaining acidity constants are pK8 = 1.36, pK1 = 2 23, pK6 = 6.63, and pKe = 8.34. The values of pKg and pKa are appreciably decreased in the presence of
James I. Watters +2 more
openaire +1 more source
Acids: Natural Acids and Acidulants
2003Acids, or acidulants as they are also called, are commonly used in food processing as flavor intensifiers, preservatives, buffers, meat-curing agents, viscosity modifiers, and leavening agents. This article discusses the functions that acidulants have in food systems and reviews the more commonly used food acidulants.
openaire +1 more source
Proton Acids, Lewis Acids, Hard Acids, Soft Acids and Superacids
1975Although the terms acid and base have been in use since the early days of chemistry, the meaning of these terms has undergone considerable modification through the centuries and continues even today with the recent introduction of new terms such as hard acid, soft acid and superacid.
openaire +1 more source
Alendronic acid/ibandronic acid/risedronic acid/zoledronic acid
Reactions Weekly, 2016openaire +1 more source