⑵ 10? Titanium dioxide ++ 2H 2o = titanium dioxide ↓+2H+
⑶ d
Based on the preparation and application of titanium and its compounds, this topic examines students' ability to solve practical industrial problems by using chemical theoretical knowledge, as well as their ability to observe, analyze, use and process charts and graphic data.
(1) The occurrence of chemical reaction must satisfy at least one of "enthalpy change is less than zero and entropy change is greater than zero"; Considering the reaction of magnesium metal with oxygen, nitrogen and carbon dioxide in the air (students are not familiar with the properties of titanium and the hydrolysis of titanium tetrachloride), the reaction is controlled under the condition of air isolation (or inert environment). ⑵ The first question mainly investigates the simple calculation of K sp and pH, and the second question, TiO(OH) 2 is the easiest to hydrolyze because of the smallest K sp. ⑶ According to m [BaTiO (C2O4) 2 4h2o]: m (BaTiO 3) =10.00: 5.19, the chemical formula of white solid A is BaTiO (C2O4) 2 4h2o.