TISLT uttor. Answer the following questions using complete sentences and support
ID: 694055 • Letter: T
Question
TISLT uttor. Answer the following questions using complete sentences and support your answers with calculations, if desired. Attach additional pages as necessary. Handwritten or typed answers are acceptable. 1. Would the reported concentration of limiting reactant solution be greater than, less than, if the precipitate was not 2. Describe the effect on the calculated concentration of the limiting reactant solution if the or equal to the true concentration of limiting reactant solution completely dry when its mass was determined? Explain your answer. sample was not digested properly. 3. Suppose your absent-minded lab partner grabbed medium porosity filter paper instead of the fine porosity paper and you noticed cloudiness in your filtrate. Will the reported concentration of limiting reactant solution be great than, less than, or equal to the true concentration of limiting reactant solution? Explain your answer. 4. Examine the difference between your calculated concentration of limiting reactant and the actual concentration that was given. Describe plausible experimental conditions which might have lead to the difference between the two. ("It was still wet" will receive zero credit.) 5. Write a conclusion for the Limiting Reactant lab. (Reference Appendix on guidelines for .if the precip is not compietig dry thu mass of the watr will ads to massor theveactant so the yyass of the limiting reactant will be mord laboratory writing) (20 pts additional)Explanation / Answer
1.)
If the precipitate is not completely dry the mass of water will add to the mass of reactant
So mass of the limiting reactant will be more
More mass --> more moles
More moles --> more concentration
Answer is greater than true one
2)
If sample is digested properly then limiting reactant is completely consumed i.e., concentrations of limiting reactant is zero.
But if the sample is not digested completely then limiting reactant will remain unreacted and in this case concentration of limiting reactant is greater than zero.
therefore,Calculated concentration >zero
For example:
HCl+NaOH->NaCl+H2O
Since NaOH is less,it is limiting reactant
If sample is completely digested then no NaOH ,only HCl will remain since it is excess.If sample is not digested properly then we get some concentration of NaOH.
3)
The particulate matter causes cloudiness in solutions. Removing cloudiness is not an easy task for many chemists. Its removal depends how gelatinous it is. The higher its gelatinous it is more difficult to filter. Obviously one should use fine porosity filter paper to get better results. In case if medium porosity filter paper is used then filtration may not be efficient.
If we see cloudiness in the filtrate we can conclusively say that filtration is not efficient.
This increases the overall weight of sample but infact the sample weight is not true weight of the sample as it includes the weight of cloudiness as well.
So the reported mass percent of limiting reactant will be less than to the true mass percent of limiting reactant in the sample
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