recrystallization - 2024 PLAYTIME

Question

This technique may be performed using Craig tubes. For 10 points each:

[10h] Name this technique which leaves behind a solution called the mother liquor. Chemists may use a stir rod to scratch the flask in order to help initiate this purification process.

ANSWER: recrystallization

[10m] This technique partitions compounds by solubility into aqueous and organic phases. It is performed using separatory funnels.

ANSWER: liquid-liquid extraction [or LLE; accept solvent extraction; prompt on partitioning]

[10e] Following extraction, these substances may be removed from the sample using a rotovap. Water is often referred to as the “universal” one of these substances.

ANSWER: solvents

<DN, Chemistry>

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2025 PLAYTIME @ CWRU	12/10/2024	Y	4	12.50	100%	25%	0%
2025 PLAYTIME @ Claremont	12/10/2024	Y	1	20.00	100%	0%	100%
2025 PLAYTIME @ Florida	12/10/2024	Y	1	20.00	100%	100%	0%
2025 PLAYTIME @ Florida	12/10/2024	Y	1	10.00	100%	0%	0%
2024 PLAYTIME @ Harvard	04/26/2025	Y	3	13.33	100%	33%	0%
2024 PLAYTIME @ JHU	10/26/2024	Y	1	20.00	100%	0%	100%
2025 PLAYTIME @ Northwest	12/10/2024	Y	2	20.00	100%	50%	50%
2025 PLAYTIME Online	04/26/2025	Y	9	22.22	100%	78%	44%
2025 PLAYTIME @ Sheffield	12/10/2024	Y	2	20.00	100%	50%	50%
2024 PLAYTIME @ UBC	10/05/2024	Y	3	20.00	100%	33%	67%
2024 PLAYTIME @ Virginia Tech	07/11/2025	Y	3	13.33	100%	0%	33%
2024 PLAYTIME @ WashU	10/12/2024	Y	6	16.67	100%	50%	17%

Data


Michigan A	Pittsburgh	0	10	10	20
P.C.‚ Daniel‚ Michel‚ and Jason B	Art of Premature Signaling	10	0	10	20
Michigan C	Ohio State A	0	0	10	10
Ohio State B	Michigan B	0	0	10	10
Oberlin	Ohio State D	0	0	10	10
Lexington	Belmont	0	0	10	10
BU	Harvard	0	0	10	10
MIT	Brandeis	0	10	10	20
CWRU	George Mason A	10	0	10	20
Arizona State University A	Carleton	10	10	10	30
UW A	UW B	0	0	10	10
Notre Dame + Epic Games	2 Italians, 2 Poles, All Noles	10	10	10	30
Keeping Up With the Cardassians	Edwin Laundrorat's Long-Lost Man Unclothès Rat Degrosses	0	10	10	20
Qin Shi Huang's Immortality Poison	Too much from you lately	0	0	10	10
Gruh	Mahjonng Masters	0	10	10	20
Mike Dukakis Tank Battalion	Monsieur Hulot's Academic Team	0	10	10	20
Trip-Hop Quizzer Tricky	Free Agents 1	10	10	10	30
evil women enjoyers	Egypt Airlines Haters	0	10	10	20
MSJ	mongeese	10	10	10	30
Illinois Orange	we need new names	10	10	10	30
Cambridge	Sheffield B	10	10	10	30
LSE	Warwick A	0	0	10	10
Waterloo C	Guelph	10	0	10	20
Toronto C	Simon Fraser	0	0	10	10
Waterloo A	McGill A	10	10	10	30
4 quizbowl pros go Virginia on North Carolina	Adrianne Lenker 4 Nobel Lit Prize 2K65	10	0	10	20
Ashurbanipal’s Drag Race	Master and Margaritaville	0	0	10	10
Somehow Paula Deen Returned	Even in Blacksburg There I Am	0	0	10	10
Chicago B	WashU Squirtle	10	10	10	30
Chicago A	Illinois A	0	0	10	10
Illinois B	Illinois C	0	0	10	10
Truman State	Iowa State	0	0	10	10
Missouri	WashU Bulbasaur	0	10	10	20
WashU Charmander	SIUE	0	10	10	20
Four Generalists in Search of a Power	Auburn 2026	0	0	10	10
Quatumvirate	Goober Gang	0	0	10	10