LABORATORY FOR GENERAL AND INORGANIC CHEMISTRY
Learning outcomes of the course unit
- To initiate the students to the safety measures of a chemical laboratory - To furnish the adeguate skills for: - the identification of inorganic chemicals and their reactivty as well as the ability of conducting simple inorganic reactions - to prepare standard solutions of inorganic compounds - to carry out volumetric titrations for the determination of the concentration of water solutions - to predict the solubility in water of inorganic compounds - to be able to fill a laboratory book properly.
Course contents summary
Frontal lessons: Safety in a chemical lab. "R" and "S" notions. - Units of measure of the International System (SI); significant figures; precision and accuracy of a measure. State of matter - physical and chemical transformations; pure substances (elements and compounds); heterogeneous and homogeneous mixtures; atomic structure (a brief account); atomic number; mass number; isotopes; electronic configurations; Periodic Table (a brief description); classification of the elements (metal, non-metals, metalloids); formation of ions (cations and anions); naming of ions. The mole -empirical and molecular formulas; percent composition data; molecular weight; equivalent and equivalent weight. Chemical reactions - acid-base reactions and the formation of salts; naming of salts; precipitation reactions; gas-forming reactions; red-ox reactions; dismutations; percent yield; weight relations in chemical reactions:stoichiometry; limiting reactant; the use of the mole or of the equivalent in the stoichiometry of reactions. Solubility in water of inorganic compounds - guidelines for the prediction of the solubility of inorganic compounds in water; aqueous solutions - the solution process (a brief account); units of concentration (percent weight, molarity, normality, molality, molar fraction); correlations between the units of concentration. Volumetric titrations - equivalence point; red-ox titrations; acid-base titrations; strong acids and bases and their behaviour in aqueous solution; weak acids and bases and their behaviour in aqueous solution; pH of acqueous solutions of strong and weak bases; titration of HCl and CH3COOH with NaOH; pH indicators; titration curves; hydrolysis of salts in aqueous solutions. Solubility - solubility product constant (Ksp); solubility of a salt from its Ksp.
Exercises covering all the main aspects of the program will be carried out
Laboratory practice - Use of chemical naming for the identification of inorganic compounds. Reactivity tests. Separation of different solutes on the basis of their different solubilities in water. Preparation of standard water solutions of different solutes. Acid/bases titrations; oxidimetric titrations; construction of the titration curve. Determination of the absolute temperature. Ideal gasses law.
Chimica, Kotz and Treichel, EDISES
Il laboratorio di Chimica, Consiglio – Frenna – Orecchio, EdiSES
Lecture notes covering the entire program (and the laboratory practices) will be furnished.
The exam consists of a written test regarding the stoichiometry and of the evaluation of the laboratory book that each student must deliver before doing the written test.
The exam is integrated with CHIMICA GENERALE ED INORGANICA