盐类水解10析（10 analysis of hydrolysis of salts）.docVIP

盐类水解10析（10 analysis of hydrolysis of salts） The knowledge of hydrolysis of salt involves a wide range, and its types and contents can be roughly summarized into the following ten cases. First, determine the acidity and alkalinity of the salt solution and its relative strength Example 1. [MCE, 92, 24] four solutions of the same temperature and amount of the same substance: CH3COONa, NaHSO4, NaCl, phenol sodium, according to pH from large to small, the correct arrangement is (). A. B. C., D. This question examines the students understanding and understanding of the hydrolysis law of salts. Both sodium bisulfate and sodium chloride are strong acids, strong bases and salts which do not hydrolyze. Sodium Chloride Solution is neutral, sodium bisulfate solution is acidic. The other two salt water solution is alkaline hydrolysis, and compared the relative strength according to the water solution of weaker alkaline hydrolysis rule, ion and water that is composed of the ionization of H + or Oh - salt combined weak electrolyte, the ionization degree is smaller, the greater the degree of salt hydrolysis, hydrolysis product of sodium acetic acid and phenol sodium respectively is acetic acid and phenol, because phenol is weaker than acetic acid electrolyte, the hydrolysis degree of phenol sodium, its aqueous solution is alkaline strong, pH is large, the right option for D. Two. Analysis of certain chemical phenomena or phenomena (1) colloidal purified water: such as KAl (SO4) 2, 12H2O, AlCl3, FeCl3, FeCl2, etc., why can purify water? Because Fe3 +, Fe2 + Al3, can be hydrolyzed Al (OH) 3, Fe (OH) 3 colloid. (2) preparation of colloids: for example, when preparing Fe (OH) 3 colloid, why should FeCl3 saturated solution be dropped into boiling water? Because FeCl33H2OFe (OH) 33HCl, positive reaction is endothermic, temperature rise, the balance is moving, the degree of hydrolysis increased, generating Fe (OH) 3 colloid. (3) the preparation of salt solution, such as the