(Solved): Lab 1: Reduction of Vanillin to Vanillyl Alcohol Using NaBH4 Dissolve 2.0 g (0.013 moles) of vanill ...

Lab 1: Reduction of Vanillin to Vanillyl Alcohol Using NaBH₄

1. Dissolve 2.0 g (0.013 moles) of vanillin in 15 mL of 1 M sodium hydroxide (NaOH) in a 100 mL beaker. Sample weight 2.13 g vanillin and 15 mL NaOH.
2. Add 0.25 g (0.0066 moles) of sodium borohydride (NaBH₄) and swirl the beaker occasionally for the next 15 – 20 minutes. NOTE: SODIUM BOROHYDRIDE IS FLAMMABLE AND CORROSIVE. AVOID CONTACT OF THE SKIN OR EYES AND FLUSH WITH WATER COPIOUSLY IF CONTACT OCCURS. WEAR GLOVES AND BE SURE YOUR SAFETY GLASSES ARE ON. Sample weight 0.248 g sodium borohydride.
3. Cool the solution in an ice-bath for 5 minutes.
4. Slowly add approximately 6 - 8 mL of 2.5M HCl, the pH is just <2 (this reprotonates the phenol group to precipitate the product.) NOTE: THE ACID ADDITION CAN CAUSE SEVERE FOAMING. 8 mL of 2.5M HCL.
5. Collect the product using a B?chner funnel, wash the filter cake with three 0.5 mL portions of cold water. Allow the sample to air-dry until the next lab. Sample weight after drying is 1.38 g.
6. After drying, obtain the sample weight and calculate the percent yield.

CAN YOU COMPLETE MY LAB REPORT?

Balanced Chemical Equation:
Show or NA (this would be given in the lab)

Mechanism:
Show or NA (this would be given in the lab)

Table of Reagents:

List all chemicals used in the lab:

Pertinent Safety Information:

1. List all safety issues for the lab (at minimum: safety glasses, fume hood, etc)

2. Data and Observations
Data: Distillate weight _________________ grams
Observations: Discuss any observations made while collecting the data.

3. Results and Discussion
Results: Yield _____________________
Boiling Range __________________________
Discussion: Discuss what results and the logic or instrument used to obtain the results.

4. Conclusions
This section is dependent on the lab and what occurs to your sample as you proceed with
the lab. Some examples may include a discussion on over heating your sample which affects the
yield or not being able to regulate the temperature consistently which also affects the yield.