Question

A primary standard was prepared with a concentration of 0.0325M Azulene dissolved in ethanol A secondary standard is prepared my pipetting 20 00mL of the primary standard into a flask, and then adding ethanol to the flask until the solution volume is 250.00ml. Determine the concentration of this secondary standard in the flask. CA. 4.06M B. 0.0240M C. 0.0260M D. 4.39M E.0.00650 A particular organic dye has an accepted value for the molar absorption coefficient at 610nm: 4588cmM An experiment determined a value of 4475 cm M for the same that dye at 610nm. Determine the percent error for the experimental value. A.0.18% B. 0.025% C-113% D.-2.5% A titration was done using 0.2004M KOH as both standard and titrant. The analyte was 0.0257g of an unidentified weak organic acid that was dissolved in water to make a 25 Omt solution estimate the volume and pH at the equivalence point.

Answer 1

solution ţ det con contrath of poimary som be M, = 0.032519 volume added = zom how concentram a secondary be Mg = ?? Ve final volumes 250 ml - So Min = M2V2 e n =) 0:0325x20= M x2 50 M2= 206X 1073M