Chm 202 Lab 8 Titration Curve Rev3 G5 19 11 16 3 Determination Of The Molecular Weight Of An Unknown Acid 5 Unknown Id 1 (50.09 KiB) Viewed 48 times
Chm 202 Lab 8 Titration Curve Rev3 G5 19 11 16 3 Determination Of The Molecular Weight Of An Unknown Acid 5 Unknown Id 2 (45.81 KiB) Viewed 48 times
Chm 202 Lab 8 Titration Curve Rev3 G5 19 11 16 3 Determination Of The Molecular Weight Of An Unknown Acid 5 Unknown Id 3 (45.81 KiB) Viewed 48 times
CHM-202 Lab 8 Titration Curve Rev3 G5-19 11/16 3. Determination of the Molecular Weight of an Unknown Acid. 5 Unknown ID number: Trial 1 Trial 2 Trial 3 Mass of acid 3041 22443248 Total volume NaOH 50mL Soml Soml 4 min 104min Total Time 4 min Time at endpoint 2.40 01.42 2.27 Volume at endpoint 10mL 21 mL 8 mL moles of NaOH moles of acid (more than one proton?) MW of acid Average MW of trials
Chemical Reactions: 9/16 1. KHP Standardization HKC8H4O4 + NaOH NakC&H:04 + H20 KHP) Note: KHP has a MW of 207.2 syſmole and only one acidic proton 2. Acetic acid reaction HC2H:O2 + NaOH NaC H302 + H20 Results: 1. Preparation and standardization of Sodium Hydroxide Solution. Mass of KHP Volume of NaOH at endpoint 0.4079 g 17mL Moles of KHP (FW = 204.2 g/mole) 0.4079 Molarity of NaOH M=0.00199 204.2 =0.11 75M 17810€ Molarity of NaOH from other groups oll sc 0.1189 0. 1148 Average NaOH molarity 0.1167M
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