A. Calculate the molality of the solution. B. Calculate the theoretical freezing point of the solution. C. Anna performed the same experiment from CHEM 18.1 where she constructed the cooling curve of the solution. From the cooling curve, she obtained the break temperature as 67 °C and the arrest temperature as 65 °C. Calculate the percent error of the freezing point of the solution. D. Based on percent error, will Alan help Anna in funding the construction of research laboratory?

Appl Of Ms Excel In Analytical Chemistry
2nd Edition
ISBN:9781285686691
Author:Crouch
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Chapter4: Least-squares And Calibration Methods
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Anna Divi, a young and ambitious researcher, is planning to put
her very own research laboratory. However, she does not have the funds for this to happen. She
then approached Alan Read, CEO of a well-known funding agency, to help her pursue her dream laboratory. Before Alan considers Anna's proposal, Anna must
perform an experiment on determining the melting point of solutions. She must have an accurate result with a percent error not greater than 3%. The data on the
experiment is given below. Help Anna achieve her goals by performing the necessary calculations below.
Table 1. Data on the determination of the melting point of the solution.
Parameters
Values
Theoretical freezing point of solvent, °C
65.8
Freezing point depression constant (kç) of solvent,
°C m-1
2.49
mass of solute, g
0.250
mass of solvent, g
2.100
molar mass of solute, g mol-1
148.21
A. Calculate the molality of the solution.
B. Calculate the theoretical freezing point of the solution.
C. Anna performed the same experiment from CHEM 18.1 where she constructed the cooling curve of the solution. From the cooling curve, she obtained the
break temperature as 67 °C and the arrest temperature as 65 °C. Calculate the percent error of the freezing point of the solution.
D. Based on percent error, will Alan help Anna in funding the construction of research laboratory?
Transcribed Image Text:Anna Divi, a young and ambitious researcher, is planning to put her very own research laboratory. However, she does not have the funds for this to happen. She then approached Alan Read, CEO of a well-known funding agency, to help her pursue her dream laboratory. Before Alan considers Anna's proposal, Anna must perform an experiment on determining the melting point of solutions. She must have an accurate result with a percent error not greater than 3%. The data on the experiment is given below. Help Anna achieve her goals by performing the necessary calculations below. Table 1. Data on the determination of the melting point of the solution. Parameters Values Theoretical freezing point of solvent, °C 65.8 Freezing point depression constant (kç) of solvent, °C m-1 2.49 mass of solute, g 0.250 mass of solvent, g 2.100 molar mass of solute, g mol-1 148.21 A. Calculate the molality of the solution. B. Calculate the theoretical freezing point of the solution. C. Anna performed the same experiment from CHEM 18.1 where she constructed the cooling curve of the solution. From the cooling curve, she obtained the break temperature as 67 °C and the arrest temperature as 65 °C. Calculate the percent error of the freezing point of the solution. D. Based on percent error, will Alan help Anna in funding the construction of research laboratory?
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