Thermodynamics & Solubility Experiment: KNO3(s)+H2O(l)--->K^1(aq)+NO3^-1(aq)
1) What is the value of the equilibrium constant in this experiment when 13.012 grams of KNO3 dissolves 13.70 ml of water?
2) What are the units of the slope of a line from a graph of lnK vs 1/T, where T is measured in Kelvin units? Show your work.
3) A linear regression analysis for this lab is y=-18.5x+5.96. Calculate the value of the enthalpy and entropy of the reaction. THEN, use your results to calculate the standard Gibbs Energy value at 298 K. Watch your units.
Q1.
Ksp = [K+][NO3-]
calculate molarity o KNO3
mol of KNO3 = mass/MW = 13.012/101.1032 = 0.1287001 mol
V = 13.70*10^-3 L
M = mol/V = 0.1287001 / (13.70*10^-3) = 9.39 M
so
Ksp = 9.39*9.39
Ksp 88.1721 for KNO3
Q2.
units of slope whne we use
lnK vs 1/T
then
must be those of T
since lnK is dimensionless and
1/T must be cancelled so units must be those of T (KELVIN)
Q3.
enthalpy and entropy of reaction
slope = -dhvap/R
-18.5 = -dHVap/8.314
Hvap = (18.5*8.314) = 153.809 J/molK
entropy
intercept = dS/R
dS = R*intercept = 5.96*8.314 = 49.55144 J/molK
Calculate dG
dG = dH - T*dS = (153.809) - 298*49.55144 = -14612.520 J/mol
Thermodynamics & Solubility Experiment: KNO3(s)+H2O(l)--->K^1(aq)+NO3^-1(aq) 1) What is the value of the equilibrium constant in this...
Fill in the data sheet and please show your work for the
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Thermodynamics of Potassium nitrate dissolving in water
KNO3(s) ↔
K+ (aq) +
NO3-(aq
Determine the thermodynamic variables, ΔG, ΔH, and ΔS, for the
dissolving of KNO3 in water. You will find these
variables by creating a Van’T Plot, which is a graph of
lnK(sp) vs 1/T.
A set amount of KNO3 is weighed and dissolved in 25mL
of water and heated until all the KNO3 is
dissolved....
I need help with 11 and 12 please.
Data Table Mixture NaCl (s) + H2O (1) T (initial) T, (final) AT (T-T) -.20 25.00 24.80 NaNO, (s) + H2O (1) 24.99 24.11 -.88 NaCH,COO + H2O (1) 24.99 25.91 .82 Use your experimental data to answer the following questions: 7. Calculate AT (AT = T2-T) for each mixture and record the results in the data table. 8. An exothermic process releases heat (warms up), and an endothermic process absorbs heat...
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Write the chemical equation for the dissolution of calcium hydroxide in water, and write its corresponding K_sp equilibrium expression. Write the balanced chemical equation for the reaction of HCl with calcium hydroxide, which yields water and calcium chloride. During the experiment, 25.00 mL of calcium hydroxide solution was titrated with 5.50 mL of 0.102 M HCl. Determine the mass of calcium hydroxide (in grams) used in the titration based on...
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DISCUSSION 1. Does the solubility of borax increase or decrease when the temperature is raised? Explain. 2. Is the forward reaction endothermic or exothermic? Justify your answer 3. Describe the mathematical changes in K, with increase in temperature and relate these numerical changes to the solubility of borax. Explain your anster 4. Calculate the sign and value of AS according to Eq. 12.7. Based on the bal- anced chemical equation for this reaction (Eq. 12.1),...
10. When sodium chloride
dissolves in water, the ions dissociate: NaCl (s) = Na+
(aq) + Cl- (aq)
Write ionic equations, similar to the one above, that describe
how NaNO3 and NaCH3CO2 each
dissociate as they dissolve in water. Include heat as a reactant or
product in each equation.
Here is what I answered:
NaNO3 (s) = Na+ +
NO3- + heat
NaC2H3O2 + Heat =
Na+ +
C2H3O2-(ag)
Lab data table attached to determine where to place heat.
AGO no...
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REPORT SHEET Determination of the Solubility-Product Constant for a Sparingly Soluble Salt EXPERIMENT 8 A. Preparation of a Calibration Curve Initial (Cro121 0.0024 M Absorbance 5 mL Volume of 0.0024 M K Cro Total volume 1. I mL 100 mL 2. 100ML 3. 10 mL 100ml 4. 15 mL 100 ML Molar extinction coefficient for [CrO2) [Cro,2) 2.4x100M 12x1044 2.4810M 3.6810M 0.04) 2037.37 0.85 1.13 2. 3. Average molar extinction coefficient...
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I wanna understand if I got the slope right and how to
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Plz help!! how do I find specific rate constant k, 1/T, In
K
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Rates of Chemical Reactions: Report Form Rate Law Summary: (a) From your measurements, what are the reaction orders with respect to each of the three reactants H;O; HOO (b) What is the rate expression (rate law) for the uncatalyzed reaction? Rate = K LT-] [H202) (c) What is the total reaction order? 2 3. Effect of Temperature on the Reaction Rate...
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