Recrystallisation project

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A checked version of this page, approved on 3 November 2011, was based off this revision.

This page will be used to upload data from the SUNY Potsdam recrystallization project, which are taken from a group of around 75 students in an introductory organic chemistry lab course. Other universities and schools are welcome to join this group, to contribute and compare results from different students - please leave a note on the discussion page, or simply add your data below. This page is released under a CC-BY-SA-NC-3.0 licence, and the data are declared to be open data.

The project

Students were given a sample of an organic solid (originally >98% pure) that had been ground up with 5 %(w/w) Urea and 0.4% Alizarin yellow dye. This is referred to as the "impure" sample. They recrystallised the sample from water, and recorded the % recovery and the melting point after purification. The organic solids were as follows:

At SUNY Potsdam, the students had only recently learnt how to take melting points.

Results

trans-Cinnamic acid

**Table 1: *trans*-Cinnamic acid results**
Entry	Institution	% Recovery	MP	Impure MP	Date
1	SUNY Potsdam	71.2	111-114*	104-108*	Sep 12, 2011
2	SUNY Potsdam	71.4	131-136	125-130	Sep 12, 2011
3	SUNY Potsdam	77	132-136	110-128	Sep 12, 2011
4	SUNY Potsdam	85.8	132-136	110-128	Sep 12, 2011
5	SUNY Potsdam	74.6	133-134	101-127	Sep 12, 2011
6	SUNY Potsdam	68.8	131-133	116-124	Sep 12, 2011
7	SUNY Potsdam	69.5	133-134	101-127	Sep 12, 2011
8	SUNY Potsdam	71.8	131-134	138-141	Sep 12, 2011
9	SUNY Potsdam				Sep 12, 2011
10	SUNY Potsdam				Sep 12, 2011
11	SUNY Potsdam				Sep 12, 2011
12	SUNY Potsdam				Sep 12, 2011
13	SUNY Potsdam				Sep 12, 2011
14	SUNY Potsdam				Sep 12, 2011
15	SUNY Potsdam				Sep 12, 2011
16	SUNY Potsdam				Sep 12, 2011
17	SUNY Potsdam				Sep 12, 2011
18	SUNY Potsdam				Sep 12, 2011

It is suspected that this student used acetanilide by mistake. The results for entry 1 are therefore to be discounted.

Acetanilide

For the SUNY Potsdam group on Sep 13, 2011, the crude MP was performed by an instructor - students only ran the MP test on their purified samples.

**Table 1: Acetanilide results**
Entry	Institution	% Recovery	MP	Impure MP	Date
1	SUNY Potsdam	N/A	N/A	97-110	Sep 13, 2011
2	SUNY Potsdam				Sep 13, 2011
3	SUNY Potsdam				Sep 13, 2011
4	SUNY Potsdam				Sep 13, 2011
5	SUNY Potsdam				Sep 13, 2011
6	SUNY Potsdam				Sep 13, 2011
7	SUNY Potsdam				Sep 13, 2011
8	SUNY Potsdam				Sep 13, 2011
9	SUNY Potsdam				Sep 13, 2011
10	SUNY Potsdam				Sep 13, 2011
11	SUNY Potsdam				Sep 13, 2011
12	SUNY Potsdam				Sep 13, 2011
13	SUNY Potsdam				Sep 13, 2011
14	SUNY Potsdam				Sep 13, 2011
15	SUNY Potsdam				Sep 13, 2011
16	SUNY Potsdam				Sep 13, 2011
17	SUNY Potsdam				Sep 13, 2011
18	SUNY Potsdam				Sep 13, 2011

meta-Anisic acid

**Table 1: *meta*-Anisic acid results**
Entry	Institution	% Recovery	MP	Impure MP	Date
1	SUNY Potsdam	74.5	104-105	102-104	Sep 14, 2011
2	SUNY Potsdam	83.7	98-103	90-97	Sep 14, 2011
3	SUNY Potsdam	50.2	104-105	95-101	Sep 14, 2011
4	SUNY Potsdam	50.5	104-106	96-102	Sep 14, 2011
5	SUNY Potsdam	82	104-105	102-104	Sep 14, 2011
6	SUNY Potsdam	95.1	94-97	84-87	Sep 14, 2011
7	SUNY Potsdam	82.8	103-105	92-101	Sep 14, 2011
8	SUNY Potsdam	99.0	104-106	96-100	Sep 14, 2011
9	SUNY Potsdam	101.1	104-106.5	95.5-100.5	Sep 14, 2011
10	SUNY Potsdam	74.3	101-103	94-101	Sep 14, 2011
11	SUNY Potsdam				Sep 14, 2011
12	SUNY Potsdam				Sep 14, 2011
13	SUNY Potsdam				Sep 14, 2011
14	SUNY Potsdam				Sep 14, 2011
15	SUNY Potsdam				Sep 14, 2011
16	SUNY Potsdam				Sep 14, 2011
17	SUNY Potsdam				Sep 14, 2011
18	SUNY Potsdam				Sep 14, 2011

3-Hydroxybenzoic acid

**Table 1: 3-Hydroxybenzoic acid results**
Entry	Institution	% Recovery	MP	Impure MP	Date
1	SUNY Potsdam	51.3	200-203		Sep 15, 2011
2	SUNY Potsdam	79.5	195-197	190-192	Sep 15, 2011
3	SUNY Potsdam	36.3	200-203	190-191	Sep 15, 2011
4	SUNY Potsdam	78.1	197.5-203	191-194	Sep 15, 2011
5	SUNY Potsdam	79.4	201-204		Sep 15, 2011
6	SUNY Potsdam	72.8	201-205		Sep 15, 2011
7	SUNY Potsdam	~70	201-203		Sep 15, 2011
8	SUNY Potsdam	50.5	200-201		Sep 15, 2011
9	SUNY Potsdam	55.0	200-203	184-186	Sep 15, 2011
10	SUNY Potsdam	70.2	201-203	178-180	Sep 15, 2011
11	SUNY Potsdam	68.6	201-203	178-180	Sep 15, 2011
12	SUNY Potsdam	92.3	204-206	193-197	Sep 15, 2011
13	SUNY Potsdam	63.1	205-207	197.5-203	Sep 15, 2011
14	SUNY Potsdam	54.9	205-207	197.5-203	Sep 15, 2011
15	SUNY Potsdam	63.6	202-203	200-201	Sep 15, 2011
16	SUNY Potsdam	65.0	201.5-202	200-201	Sep 15, 2011
17	SUNY Potsdam	74.6	197-200	191-194	Sep 15, 2011
18	SUNY Potsdam				Sep 15, 2011

Salicylic acid

**Table 1: Salicylic acid results**
Entry	Institution	% Recovery	MP	Impure MP	Date
1	SUNY Potsdam	87.5	158-160		Sep 16, 2011
2	SUNY Potsdam	26.2	158-160		Sep 16, 2011
3	SUNY Potsdam	76.5	153-156		Sep 16, 2011
4	SUNY Potsdam	56.7	157-160		Sep 16, 2011
5	SUNY Potsdam	~60	158-160	120-148	Sep 16, 2011
6	SUNY Potsdam	94.4	153.5-156	116.5-124	Sep 16, 2011
7	SUNY Potsdam	73	160-162	142-147	Sep 16, 2011
8	SUNY Potsdam	77.6	157-160	117-122	Sep 16, 2011
9	SUNY Potsdam				Sep 16, 2011
10	SUNY Potsdam				Sep 16, 2011
11	SUNY Potsdam				Sep 16, 2011
12	SUNY Potsdam				Sep 16, 2011
13	SUNY Potsdam				Sep 16, 2011
14	SUNY Potsdam				Sep 16, 2011
15	SUNY Potsdam				Sep 16, 2011
16	SUNY Potsdam				Sep 16, 2011
17	SUNY Potsdam				Sep 16, 2011
18	SUNY Potsdam				Sep 16, 2011

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