Quick help How much acid do I need to add?

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SUMMARY

This discussion focuses on calculating the amounts of acids and bases required for various organic chemistry reactions. Specifically, it addresses the neutralization of a reaction mixture involving 1g of Benzaldehyde and 2mL of 10M KOH using 6M HCl to achieve a pH of approximately 2. Additionally, it explores the yields of 1,1-diphenylethanol and biphenyl from 1.70g of acetophenone, and the production of cyclohexane and tertiary alcohol from the reaction of cyclohexylmagnesium bromide with butanone. Key calculations involve understanding the Cannizzaro reaction and the pKa of benzoic acid.

PREREQUISITES
  • Understanding of the Cannizzaro reaction
  • Knowledge of pKa values, specifically for benzoic acid
  • Familiarity with Grignard reagents and their reactions
  • Basic stoichiometry for yield calculations in organic chemistry
NEXT STEPS
  • Calculate the pKa of benzoic acid for neutralization reactions
  • Learn about the Cannizzaro reaction and its applications
  • Study the preparation and reactions of Grignard reagents
  • Explore yield calculations for organic reactions, focusing on biphenyl and diphenylethanol
USEFUL FOR

Chemistry students, organic chemists, and laboratory technicians involved in reaction yield calculations and acid-base neutralization processes.

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Chemistry questions

Q1: Calculate the amount of 6M HCl that would be required to neutralize and acidify (to ~pH2) the reaction mixture of 1g Benzaldehyde and 2mL 10M KOH.
I think this is the chemical equation:
Benzaldehyde + KOH + H+ -> Benzyl Alcohol + Benzoic Acid


Q2: 64% yield of 1,1 - diphenylethanol and a 16% yield of biphenyl is isolated from the complete reaction of 1.70g of acetophenone. Determine the masses of the two products. Also, why is there biphenyl in the product?

Q3: In the reaction of cyclohexylmagnesium bromine with butanone, the Grignard reagent was prepared from 6.0g of cyclohexyl bromide and was then treated with a solution of 3.9g butanone in 25mL of "wet " diethyl ether (the ether contains 1.0% of water (by mass)).
i. Calculate the mass of cyclohexane that would be produced
ii. Calculate the max. theoretical yield (in grams) of tertiary alcohol (corrected for loss due to cyclohexane formation).

THANKS!
 
Last edited:
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Q1) Write the reaction as two separate reactions. One for the Cannizzaro reaction and one for the neutralization. You will need to know the pKa of benzoic acid for this answer.

Q2) Unclear. Complete reaction between acetophenone and what? Is there a catalyst present?

Q3) Write down the equations of the reaction between to produce the grignard. Also the equations for reaction of the grignard with water and butanone.
 

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