Sodium Hydroxide Standardization

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No report will be accepted for credit after November 28, 2021

 

Grade:

 

Lab average to date:

 

Overall average to date:

Results (Sodium Hydroxide Standardization – successful trials only) (35 points)

 

NOTE: KHP contains no phosphorous. Its formula is given in the laboratory directions along with its molar mass.

 

KHP Titrations

1 2
Mass of KHP    
Moles of KHP    
Initial Volume Vo    
Final Volume Vf    
Volume required (Vf – Vo)    
Molarity of NaOH    
Average Molarity of NaOH    

 

 

Results (Acetic Acid Content of Vinegar – successful trials only(35 points)

 

Use the follwing value, determined by all students performing the lab, to complete the table below:

 

Class Average Molarity for NaOH (excluding outliers): 0.2536M

 

 

Vinegar Titrations

1 2
Volume of Vinegar    
Moles of Acetic Acid in Vinegar (calculated)    
Initial Volume Vo    
Final Volume Vf    
Volume required (Vf – Vo)    
Molarity of Acetic Acid in Vinegar    
Average Molarity of Acetic Acid    
Measured % Acetic Acid in vinegar sample    
% error (As described in the directions)    

 

 

 

Questions

 

1. Show or explain your calculation for determining Measured % Acetic Acid in vinegar sample. You may incorporate a scan of your handwritten calculations if you prefer. (20 points)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2. If you or one of your laboratory partners misread the procedure and added 100 mL of distilled water to the solid KHP rather than 50 mL of water (Procedure 1.5), how would this affect the concentration of sodium hydroxide solution that you measured? Explain briefly . (10 points)

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