Question

ng to the laboratory. PULLU 5 5 C To assist you in finishing early it is recommended that you answer the questions an me end of the experiment before coming to the laboratory. The student can answer These questions once he/she has read the experiment and understands if Assume that you have followed the same procedure as outlined in this experiment and you have obtained the following data: Mass of KIO3 used 0.8000 g Volume of KIO3 solution prepared 250.0 mL Volume of unknown ascorbic acid solution 15.00 mL Volume of KIO3 solution used to reach endpoint 13.25 ml 1. Calculate the molarity of the KIO3 solution prepared. 2. Calculate the molarity of ascorbic acid in the unknown solution. 3. Assuming the density of the unknown solution is 1.00 g/mL; calculate the percentage by mass of ascorbic acid (C6H3O) in each sample.

Answer 1

Given, mass of K2O₂ Used - 0.8000 g volume of K2O3 solution prepared = 250.0ml volume of unknown ascorbic acid solution = 15.00ml volume of K2O solution used to reach end point = 13.25ml 0 Molarity of KIO, Solution prepared = ? mass of KIO, Molarity of K2O₃ = Molar Mass of KIO; 1000 vol. of KIO₂ in me Mass of KIO₃ = 0.89 bi Molar mass of KIO3 = 214 g/mol volume of KIOg solution prepared = 250 ml Molarity of kidz - 0.8 x 1000 dalton 4 250 0.015 M. - 2 molarity of ascorbic acid in the unknown solution = ? Miv = M₂ V ₂ lases where, My = Molarity of ascorbic acid = ? V = volume of ascorbic acid = 15 ml M2 = Molarity of kI O solution = 0.015 m V = volume of KDO solution used = 13.25 mL. M = M₂ V 2 0.015 mx 13.25 mL ad -0.013 M 2 v 15.00 mL Molarity of ascoabic acid in the unknown Solution = 0.013 M.

@ Percentage by mass of ascorbic acid (L6Hp 06 in each Sample : ? Given, density of unknown ascorbic acid solution - 1.00g/mL. density of Unknown solution = mass of unknown solution volume of unknown solution moey = 1.0 X 15 = 15 glams. mass of unknown ascorbic acid solution - is geams. mass of solute . Mays Y. =- - x 100 % mass of Solution Mass of solute ascorbic acid (C6 H₂O6) is to be calculated. mass of C H₂O 4000 Molarity of ascorbic acid=. M 1 Molarmass of CHg volume of C H₂O Molarity of ascorbic acid = 0.013 m Molar mass of ascorbic acid & HgQc) = 176-12 g/mol volume of ascorbic acid (C6H8O) = 15 ml 0.013 = ma 1000 . mass of C6H₂O6 176.12. 15 (C6H₂O) = 0.013 x 176.12 x 15 Mass of ascorbic acid 1000 -Mass of solute ascorbic acid = 0.034 grams. mass of ascorbic acid solution is grams Percentage by mass of ascorbic acid (C6H8O) = x 100% = 0.23 %.