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G . a glass e 1ec t r ode s ensit i ve to solut ion pR, and a r e f e rence e lectrode hav ing astahle potential inde penden t of solution canposition . tor ed usi ng a ca librated pH meter, and a t i t r at i on curve of pH against vol ume of alkal i added plo t t ed manually or automatica l ly by an au t ot i t r at or. The curve generated by t his 'pot en t i aretric titration' can be used to det ennine t he equivalence po i nt Cs) and hence to provide add i tiona l informa t i on abo ut t he acid .

4. What other techniques are suitable for the determination of magnesium and zine in a mixture? What are their advantages/disadvantap,-es? Instructor's Notes 1. There are a number of fomulations available from ehemists (drug stores) and health-food shops that eontain suffieient zine (and numerous other metals) for this analysis. 2. Preparat ion of the ion exchange resin eolumn and reagent solutions beforehand is advisable for less experieneed students. 3. 7 mg per cm3 and eontain 1 drop of coneentrated HCl to prevent hydrolysis.

F Discussion 1. Carment on t he r e lative po l arit ies o f t he five eompounds . 2. Carment on t he d iff e r en t methods of vi sua lizat ion us ed and the ehemieal r eact i ons involved. Ar e a l l t he compounds visualized with each method? 3. What i s t he observed e ffect of sampl e size on t he v isualized spots? co nelusi ons ean be dr awn? What 44 EXPERIMENT A,7 4. a. How sensitive a technique i s TLC and what are t he maj o r t wo f ac t ors affecting it ? b . What experimental factors affect Hf val ues?

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