Actual yield determination by experiment

In summary, the conversation revolved around a question on how to calculate the actual yield under experimental conditions. One person mentioned that actual yield is typically measured rather than calculated, unless it is expressed as a percentage of theoretical yield. The conversation then shifted towards methods of measuring substances and a question was asked about determining the actual yield of a specific reaction involving 1 gram of Carbon, 1 gram of LiNO3, 1 gram of Boron, and excess hydrogen. The final response provided the reaction equation and stated that the amount of products produced was unknown.
  • #1
Adrian Tudini
20
1
TL;DR Summary
Question: How does one determine the actual yield by experiment?
I am a chemistry newbie.
Hi

just one question. Can someone point to me some resources on how to calculate the actual yield under experimental conditions?

thanks.Adrian
 
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  • #2
Actual yield is something that you measure, not calculate.

That is, unless you want to express it as a percentage of a theoretical yield, but then it is just a trivial case of doing stoichiometry and calculating percentage obtained vs expected.
 
  • #3
Hi

Thanks for that.

How do you measure the actual yield itself under experimental conditions?

What equipment do you need etc...?

Thanks.
 
  • #4
What methods of measuring amount of substance do you know?
 
  • #5
10-100grams of Carbon , Boron, lithium nitrate (hygroscopic) + hydrogen (excess of)
 
  • #6
Huh? What it has to do with any measurement?
 
  • #7
Hi

Thanks for that.

Lets start over

i want to find the actual yield of this reaction:

Given 1 gram of Carbon, 1 gram of LiNO3, 1 gram of Boron + excess hydrogen, how do I determine the actual yield by experiment?

Thanks,

Adrian
 
  • #8
First you need to know what is produced and what is the reaction equation. Listing some substances and calling it "a reaction" is - at best - a misnomer.
 
  • #9
Thanks for that.

The above reaction forms Boron Carbide, water and Lithium Nitrite (LiNO2)

That is, 4B + C+ LiNO3+ H2 ->B4C + H2O+ LiNO2 (a voltage applied)

I do not know how much is produced of the products.

Thanks.

Adrian
 

1. What is the purpose of determining actual yield by experiment?

The purpose of determining actual yield by experiment is to accurately measure the amount of product that is obtained from a chemical reaction. This information is important for evaluating the efficiency of the reaction and for making adjustments to improve the yield in future experiments.

2. How is actual yield determined by experiment?

Actual yield is determined by conducting a chemical reaction and measuring the amount of product produced. This can be done by weighing the product or using other analytical techniques such as titration or spectroscopy.

3. What factors can affect the actual yield in an experiment?

There are several factors that can affect the actual yield in an experiment, including the purity of the reactants, the temperature and pressure of the reaction, and the presence of impurities or side reactions. Human error and experimental technique can also play a role in the final yield.

4. How can the actual yield be compared to the theoretical yield?

Theoretical yield is the amount of product that would be obtained if the reaction proceeded with 100% efficiency. The actual yield can be compared to the theoretical yield by calculating the percent yield, which is the actual yield divided by the theoretical yield multiplied by 100%. This gives an indication of how well the reaction performed.

5. Why is it important to calculate the percent yield in an experiment?

Calculating the percent yield is important because it allows for the evaluation of the efficiency and accuracy of the experimental procedure. A low percent yield may indicate that there were errors in the procedure or that the reaction did not proceed as expected. This information can be used to make improvements in future experiments.

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