Question

1. Calculate the value of Ksp in the following table:

Temperature (0C)	Vol (mL)	Molarity of [K]=[NO3-]	Ksp = [K][NO3-]
67.3	13.0	7.61
54.4	16.0	6.18
45	18.0	5.49
39.5	20.5	4.82
34.8	23.0	4.30

2. Transform the data in the above table so that you can plot ln Ksp in the y-axis vs 1/T (K) in the x-axis. Show the transformed data in a table as well as the graph. Include the equation and r².

3. Based on the above mentioned equation calculate ΔH and ΔS

Answer 1

Ksp = [K+][NO3-]

since [K+] = [NO3-]

Ksp = [NO-]^2

Molarity

table:

Temperature (0C)	Vol (mL)	Molarity of [K]=[NO3-]	Ksp = [K][NO3-]
67.3	13	7.61	57.9121
54.4	16	6.18	38.1924
45	18	5.49	30.1401
39.5	20.5	4.82	23.2324
34.8	23	4.3	18.49

Q2.

plot ln Ksp vs. 1/T

Q3

for

dH and dS...

intercept --> dS/R

slope --< -dH/R

so..

14.582 = intercept

dS /8.314 = 14.582

dS = 14.582*8.314 = 121.2347J/molK

dH = 8.314*3576.3 = 29733.3582 J/mol = 29.73 kJ/mol