Dominican University student project
01/30/09 Pedro Vallejo

Solute and Solvent Data
Solute
Succinic Acid
Solute SMILES
OC(CCC(O)=O)=O
Solute Type
Carboxylic Acid
Chemspider link of solute
http://www.chemspider.com/1078
Solvent
Ethanol
Solvent SMILES
CCO
(average) solubility g/100g
1.08
(average) concentration in moles/liter
0.0593
[Value marked as DONOTUSE because so low compared to rest - poor mixing likely cause JCB]
Procedure
1. Keep adding solute until no more solute can be dissolved.
2. Add saturated solution to centrifuge tube. Centrifuge for five minutes.
3. Decant into a clean 10mL graduated cylinder and measure the volume of saturated solution.
4. Obtain a 25mL beaker as the evaporation vessel. Record the mass of this evaporation vessel.
5. Pour the saturated solution into the evaporation vessel and record its mass.
6. Prepare a hot water bath and evaporate the solvent from the saturated solution. Be aware of the temperature as one does not want to melt the solute while the solute is evaporating. Do not go 5°C past ethanol’s boiling point which is 78.4°C.
7. Leave the remaining solute to sit for 5 minutes. Record the mass of remaining solute and evaporation vessel.
8. Repeat this whole process 4 times.

Table 1 – Chemical Information
Solute
Succinic Acid
Solvent
Ethanol
Solvent density
0.789 g/mL
Volume of solution
(per experiment)

5.0mL

· Mass of 50mL evaporation vessel 1: 30.548g
· Mass of 50mL evaporation vessel 2: 26.286g

Table 2Mass of Evaporation Vessel + Solution Before evaporation
Trial
Mass (g)
Experiment 1 with vessel 1
33.159
Experiment 2 with vessel 2
28.817
Experiment 3 with vessel 1
34.159
Experiment 4 with vessel 2
29.774
*For experiment 1, the mass of the evaporation vessel and solution was taken after it had been in the hot water bath for about a minute.


Table 3 – Mass of Evaporation Vessel + Solute
Trial
Mass (g)
Experiment 1 with vessel 1
30.573
Experiment 2 with vessel 2
26.306
Experiment 3 with vessel 1
30.584
Experiment 4 with vessel 2
26.345


Table 4 – Mass of Solute Obtained
Trial
Mass (g)
Experiment 1 with vessel 1
30.573-30.548 = 0.025
Experiment 2 with vessel 2
26.306-26.286 =0.02
Experiment 3 with vessel 1
30.584-30.548 = 0.036
Experiment 4 with vessel 2
26.345-26.286 = 0.059





Calculations

Table 5 – Solubility g/mL using volume of solution
Trial
Solubility (g/mL)
Experiment 1
0.005
Experiment 2
0.004
Experiment 3
0.0072
Experiment 4
0.0118

Sample calculation – Experiment 1

0.025g/5.0mL = 0.005g/mL


Table 6 – Concentration in M (moles/liter)
Trial
Concentration (moles/liter)
Experiment 1
0.0423
Experiment 2
0.0339
Experiment 3
0.0610
Experiment 4
0.0999

Molar mass of Succid Acid: 118.09 g/mol
Sample calculation – Experiment 1

(0.005g/mL) * (1000mL/1L) * (1mole/118.09g) = 0.0423 moles/liter


Table 7 – Molality in moles/kg using mass of solution
Trial
Molality (moles [solute]/kg [solvent])
Experiment 1
0.0537
Experiment 2
0.0429
Experiment 3
0.0773
Experiment 4
0.127

Density of Solvent: 0.789g/mL
Kg of solvent:
(0.789g/mL) * (5.0mL) * (1kg/1000g) = 3.945g Ethanol or 0.003945kg Ethanol

Moles of solute
Sample calculation – Experiment 1

(0.025g) * (1 mole/118.09g) = 2.12 X 10-4 moles Succinic Acid
(2.12 X 10-4 moles Succinic Acid)/(0.003945 kg Ethanol) = 0.0537g Succinic Acid/Kg Ethanol



Table 8 – Solubility g/100g solvent using mass solution
Trial
Solubility (g/100g)
Experiment 1
0.957
Experiment 2
0.790
Experiment 3
0.900
Experiment 4
1.69

Sample calculation – experiment 1

(0.025g mass of solute/[33.159g – 30.548g]) *100 = 0.957 g solute/ 100 g solution