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On the Excel spreadsheet (available in the Lab folder on HuskyCT), enter the mass of KNO3 used and the volume of the solution for each trial, along with the temperature at which the first crystals appear. You will need to complete the spreadsheet with the correct function for each calculation. For example, to convert the solution volume in mL to L (cells C6 and C7 in the spreadsheet), divide the values in C6 by 1000 (that is, in Cell C7, insert the formula =C6/1000). Do the same for the other calculations to convert to molarity, solve for Ksp, take the natural logarithm of the Ksp value, convert °C to K, etc. Finally, once all the data has been calculated, make a plot of In(Ksp) vs. 1/T. Insert a trendline and record the slope and y-intercept values to calculate the values for AG and AH. From these you can use the Gibbs- Helmholtz equation to calculate the values for AS.

On the Excel spreadsheet (available in the Lab folder on HuskyCT), enter the mass of KNO3 used and the volume of the solution for each trial, along with the temperature at which the first crystals appear. You will need to complete the spreadsheet with the correct function for each calculation. For example, to convert the solution volume in mL to L (cells C6 and C7 in the spreadsheet), divide the values in C6 by 1000 (that is, in Cell C7, insert the formula =C6/1000). Do the same for the other calculations to convert to molarity, solve for Ksp, take the natural logarithm of the Ksp value, convert °C to K, etc. Finally, once all the data has been calculated, make a plot of In(Ksp) vs. 1/T. Insert a trendline and record the slope and y-intercept values to calculate the values for AG and AH. From these you can use the Gibbs- Helmholtz equation to calculate the values for AS.

Chemistry by OpenStax (2015-05-04)
Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN:9781938168390
Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Chapter11: Solutions And Colloids
Section: Chapter Questions
Problem 3E: When KNO3 is dissolved in water, the resulting solution is significantly colder than the water was...
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Mass of KNO, (g) 10 Trial Number 2 3 4 total volume of water, mL 14 16.5 19 21.5 total volume of solution, L 1.40E-02 1.70E-02 temp at which crystals form, C 69 56 48 40 determination of Kp 101.1 moles KNO3 0.098911968 concentration KNO, 7.10E+00 6.00E+00 Ksp 5.00E+01 3.60E+01 crystallization T, K 342.13 329.13 In(Ksp) 3.910345833 3.58173972 AGJ/mol (from AG =-RTIN(K,,) 1/T, K slope of line determined by plotting In(Kp) vs 1/T) AH J/mol (from -slope/R) AS, J/K-mol (use AG = AH - TAS) average value for AS (use the y-intercept value)
Transcribed Image Text:Mass of KNO, (g) 10 Trial Number 2 3 4 total volume of water, mL 14 16.5 19 21.5 total volume of solution, L 1.40E-02 1.70E-02 temp at which crystals form, C 69 56 48 40 determination of Kp 101.1 moles KNO3 0.098911968 concentration KNO, 7.10E+00 6.00E+00 Ksp 5.00E+01 3.60E+01 crystallization T, K 342.13 329.13 In(Ksp) 3.910345833 3.58173972 AGJ/mol (from AG =-RTIN(K,,) 1/T, K slope of line determined by plotting In(Kp) vs 1/T) AH J/mol (from -slope/R) AS, J/K-mol (use AG = AH - TAS) average value for AS (use the y-intercept value)
On the Excel spreadsheet (available in the Lab folder on HuskyCT), enter the mass of KNO3 used and the volume of the solution for each trial, along with the temperature at which the first crystals appear. You will need to complete the spreadsheet with the correct function for each calculation. For example, to convert the solution volume in ml to L (cells C6 and C7 in the spreadsheet), divide the values in C6 by 1000 (that is, in Cell C7, insert the formula =C6/1000). Do the same for the other calculations to convert to molarity, solve for Ksp, take the natural logarithm of the Ksp value, convert °C to K, etc. Finally, once all the data has been calculated, make a plot of In(Ksp) vs. 1/T. Insert a trendline and record the slope and y-intercept values to calculate the values for AG and AH. From these you can use the Gibbs- Helmholtz equation to calculate the values for AS.
Transcribed Image Text:On the Excel spreadsheet (available in the Lab folder on HuskyCT), enter the mass of KNO3 used and the volume of the solution for each trial, along with the temperature at which the first crystals appear. You will need to complete the spreadsheet with the correct function for each calculation. For example, to convert the solution volume in ml to L (cells C6 and C7 in the spreadsheet), divide the values in C6 by 1000 (that is, in Cell C7, insert the formula =C6/1000). Do the same for the other calculations to convert to molarity, solve for Ksp, take the natural logarithm of the Ksp value, convert °C to K, etc. Finally, once all the data has been calculated, make a plot of In(Ksp) vs. 1/T. Insert a trendline and record the slope and y-intercept values to calculate the values for AG and AH. From these you can use the Gibbs- Helmholtz equation to calculate the values for AS.
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