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analytical chemistry hoda abd el-shafy shilkamy dr. hoda abd el-shafy acid base titrations dr. hoda abd el-shafy shilkamy redox titrations oxidation reduction reactions reference electrode chelating agents metal ions ligands complexes complexometric titrations quantative analysis quantatitive analysis hoda abd el-shafy shilkamy galvanic cell problems analytical chemistry quantatitive analysis chemistry problems analyitical chemistry faculty of science sohag university ph metric titration conductometric titration ph metry instrumental analysis calculations precipitating agent digestion precipitation gravimetric analysis gravimetry hoda abd el-shafy adsorption indicators fajans method volhard method mohar method precipitiation titrations coordnation number working electrode lecture 1