Volumetric Titration
NO | ANSWER | MARK | 1 :( i )( ii ) ( iii ) ( iv )2 :( i )( ii )( iii )3 )4 )5 ) ( i )( ii )( iii )( iv )6 )7 ) i )ii ) iii )8 )9 )10 )i ) ii )iii)11 ) | A reagent is highly serves as a reference material in all volumetric & mass titrimetric method.A reagent solution of accurately known concentration. * End point-point at which the reaction is observed to be complete and there is permenant colour change at the end of titration. * Equivalent point-point at which an equivalent amount of titrant is added to analyte. * Titrant-the reagent which is place in the burette & will added to analyte until end point reached. * Titre value-the amount of titrant by taking the final reading from burette after the end point reached. * it is high purity typically 100±0.5% * it is hygroscopic compound which is does not react with water or air. It means that it is stable for long term storage.2HCl + Na2C03 2NaCl + C02 + H20 Mole Na2C03 = 0.2329 g 2(22.99)+1(12.01)+3(16)g/mole = 0.2329g 105.99g/mole =2.197×10-3 moles From the equation , 1 Mole Na2C03 react 2 mole HCl So, 2.197×10-3 moles Na2C03 = 2.197×10-3x 2 1 = 4.394x10-3 mole HCl Thus,molarity HCl = n/v = 4.394x10-3 mole 42.87x10-3L = 0.1025 M. The suitable indicator is phenolphthalein. Primary standard | Secondary standard | * A reagent is highly serves as a reference material in all volumetric. * High purity about 99.99% purity. * Can be prepared and maintained in high state of purity. * Is unaltered in air during weighing (i.e. it is not hygroscopic). * Has high molecular formula so that weighing errors are negligible. * Will react with an appropriate solution stoichiometrically and practically instantaneously * It should be nontoxic * It should be readily available