Are these correct? 1. Sodium borohydride is stable in acidic aqueous solutions.

Question

Are these correct?

1. Sodium borohydride is stable in acidic aqueous solutions.  

True

false

2. When we add hydrochloric acid in the work up step to the reaction a gas is observed. What is the composition of the gas?

Nitrogen

water

Hydrogen

Carbon dioxide

Vanillin

3. When isolating the solid after recrystallization using vacuum filtration what solvent should you use to aid in the rinse from the Erlenmeyer flask to the vacuum filter funnel?

Cold ethanol

Cold water

Cold ethyl acetate

Hot water

Cold acetone

Select the name of the catalyst used for this reaction, if there was no catalyst used, select none:

a. Sodium borohydride

b. Sodium hydroxide

c. Vanillin

d. None

Select the name of the catalyst used for this reaction, if there was no catalyst used, select none:

a. Sodium borohydride

b. Sodium hydroxide

c. Vanillin

d. None

Draw the Reaction Equation Help with the JSME Load Reagents You do not need to balance the equation with4"in front of the alde hyde and You d not needto draw cry of the cron ateolts as ooducts ×112 OFG Step1 NaBH4,H20 NaOH Step2 HCI.H20 HO Complete the stiochiometry table using the startig values provided Density mL Molecular Weight Grams Millimoles Equivalents Reagent 3.144 vanillin sodium borohydridè sodium hydroxide (1 M aq) theoretical product vanillyl alcohol melting point of vanillyl alcohol 14.535 23.598

Explanation / Answer

1. Sodium borohydride is stable in acidic aqueous solutions.  

false

2. When we add hydrochloric acid in the work up step to the reaction a gas is observed. What is the composition of the gas?

Hydrogen

3. When isolating the solid after recrystallization using vacuum filtration what solvent should you use to aid in the rinse from the Erlenmeyer flask to the vacuum filter funnel?

Cold ethyl acetate

Table:

Compound          FW         mass(g)        mmol          Eq        density          ml       

Vanillin              152.15       0.553           3.63            1.0         1.06           0.522

NaBH4                37.83       0.550          14.535         4.0          -                   -

1M NaOH            40.00          -               14.535         4.0          1 g/ml        14.54

Vanillyl alcohol    154.17      0.560           3.63              -               -                  -         

melting point of vanillyl alcohol = 113 oC

  

The catalyst in the reaction,

d. None

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