Mass of sample/g Mass of recrystallized Yield/% benzoic acid/g Melting point of the purified sample/'C I 1.50g 0.82120g 71% Starts 121.1 Ends 124.2 5) From melting point of the purified sample and the infrared spectra make a conclusion about the purity of the benzoic acid after the recrystallization. 80 80 90 90 70- 60- Transmittance (%) 50 Benzoic acid 40- 30- 3071.1 -2834.9 A OH 10721026 809.50096 553.3- 432.2 -B T 4000 3500 3000 2500 2000 1500 1000 500 Wavenumber (cm) A 3500-2500 B 2800-2500 C 1685 E 1292 O-H stretch Overtone and combination bands C=O stretch C-O stretch F 934 Out-of-plane O-H bend म 200 45 %T 175 150 125- 100 75 50 SHIMADZU FTIR SataCCE-Mr. Hassan21 25 7000 6000 5000 4000 3000 2000 1500 1000 Carnpm DVFTIR SataCCE-Mr. Hassan21.isod Campm Item 2 Sample name 3 Sample (D 4 Option 5 Intensity Mode 6 Apodization 9 No. of Scans %Transmittance Happ-Genzel 150 Value 500 cm-1