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Data: 
 
 
 
 
 Trial 1 
 Trial 2 
 Trial 3 
 Trial 4 
 Trial 5 
 Trial 6 
 
 
 
 
 Amount of vinegar 
 10mL 
 10mL 
 10mL 
 10mL 
 10mL 
 10mL 
 
 
 Initial NaOH 
 1mL 
 9.9mL 
 18.0mL 
 26.2mL 
 34.4mL 
 36.65mL 
 
 
 Final NaOH 
 9.9mL 
 18.0mL 
 26.2mL 
 34.4mL 
 42.65mL 
 44.6mL 
 
 
 
 Observations: 
 First trial turned dark pink, too much NaOH. Accidentally let out a stream of NaOH near the endpoint. Trial 2 was a light pink, better than trial 1. Trial 3 was terrible. I accidentally added a stream of NaOH. Trial 4 was clear. half a drop turned it pink. Trial 5 was also a drop over from being clear and pink. Trial 6, you can barely tell that it is pink. If you look really close, you can see a very faint pink. It is really close to perfect. With some distilled water. 
   
 Analysis:

 CH 3 COOH+NaOH->CH 3 COONa+H 2 O 
 Trial 1: 
 9.90mL-1.00mL= 8.90mL NaOH used 
 1.00M*8.90mL/1000=0.0089 mol NaOH 
 0.0089 mol/10mL/1000= 0.890M Acetic Acid 
 Trial 2: 
 18.0mL-9.9mL= 8.1mL 
 (8.1/1000)/(10mL/1000)= 0.81M 
 Trial 3: 
 26.2mL-18.0mL= 8.2mL 
 (8.2mL/1000)/(10mL/1000)= 0.82M