solubility - 2025 ACF Fall

Question

The common-ion effect refers to the decrease in this property of the precipitate when an ion shared by a weak electrolyte is added. For 10 points each:

[10e] Name this property that can be quantified with a Ksp (“K-S-P”), its namesake “product constant,” or as the amount of one substance dissolved in another at maximum saturation.

ANSWER: solubility [accept word forms like soluble; accept solubility product constant]

[10m] The decreased solubility resulting from the common-ion effect can be explained using this principle. This principle predicts that the forward reaction becomes more favorable with higher reactant concentration.

ANSWER: Le Chatelier’s (“luh sha-tell-YAY’s”) principle [or Braun–Le Chatelier principle or Le Chatelier–Braun principle; prompt on equilibrium law]

[10h] This quantity for ionic solutions is important for describing deviations from ideality since the Debye (“duh-BYE”) length is inversely proportional to its square root. This quantity equals [read slowly] “one-half times the sum over all ions of concentration times charge squared.”

ANSWER: ionic strength [or molar ionic strength]

<Editors, Chemistry>

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Summary


Southern California	Main	Y	7	20.00	86%	100%	14%
Eastern Canada (2)	Main	Y	10	18.00	90%	80%	10%
Great Lakes	Main	Y	12	15.00	75%	75%	0%
Lower Mid-Atlantic	Main	Y	6	5.00	17%	33%	0%
Upper Mid-Atlantic	Main	Y	12	10.83	75%	33%	0%
Midwest	Main	Y	9	12.22	67%	56%	0%
Northeast	Main	Y	12	10.83	67%	42%	0%
Pacific	Main	Y	9	10.00	56%	44%	0%
Southeast	Main	Y	12	11.67	67%	50%	0%
UK (North)	UK	Y	5	12.00	40%	80%	0%
UK (South)	UK	Y	8	12.50	63%	63%	0%
Upstate NY	Main	Y	5	12.00	100%	20%	0%

Data


UCSD A	Claremont B	10	10	0	20
Claremont A	UC Santa Barbara	0	10	0	10
UCLA A	UCLA F	10	10	10	30
UCLA C	UCLA D	10	10	0	20
UCLA E	Claremont C	10	10	0	20
UCSD B	UCLA B	10	10	0	20
UC Irvine	USC A	10	10	0	20
Waterloo B	Guelph A	10	10	0	20
McMaster A	Toronto C	10	10	10	30
Toronto D	Toronto A	0	0	0	0
Toronto B	Waterloo A	10	10	0	20
Toronto E	Waterloo C	10	10	0	20
Brock A	Toronto F	10	0	0	10
McMaster B	Toronto G	10	10	0	20
Toronto H	McMaster C	10	10	0	20
McMaster C	Toronto H	10	10	0	20
Queen's A	Toronto I	10	10	0	20
Michigan B	CWRU A	10	10	0	20
CWRU B	Michigan State A	10	10	0	20
Louisville A	Michigan A	10	10	0	20
CWRU C	Louisville D	10	10	0	20
Michigan C	Ohio State A	0	0	0	0
Kentucky	Michigan D	10	10	0	20
Michigan State B	CWRU D	0	0	0	0
Ohio State D	Michigan State D	10	10	0	20
Ohio State C	Pittsburgh	10	10	0	20
WVU A	Louisville C	10	10	0	20
Michigan State C	WVU B	0	0	0	0
JMU A	Duke A	0	0	0	0
Liberty B	Liberty C	0	10	0	10
JMU B	Tusculum A	0	0	0	0
UNC D	VCU A	10	10	0	20
Virginia Tech C	UNC B	0	0	0	0
Liberty A	William & Mary B	0	0	0	0
Rutgers B	Columbia A	10	0	0	10
George Mason A	Maryland A	10	0	0	10
Vassar A	George Mason B	10	0	0	10
George Mason C	NYU C	10	0	0	10
Penn	Johns Hopkins	10	10	0	20
Lehigh B	Princeton	10	0	0	10
Maryland B	Maryland C	10	10	0	20
NYU B	Lehigh A	0	10	0	10
Rutgers A	NYU A	0	0	0	0
Rowan	Rutgers C	0	0	0	0
Stony Brook	Rutgers D	10	0	0	10
Columbia B	Vassar B	10	10	0	20
Chicago B	William Woods University A	10	10	0	20
Illinois Blue	WashU Grizzlers	10	10	0	20
Illinois Champaign	Iowa A	0	0	0	0
Rose-Hulman A	Illinois Orange	10	0	0	10
Chicago A	Indiana A	10	10	0	20
Indiana B	Iowa B	10	0	0	10
Purdue A	Purdue B	10	10	0	20
Illinois Urbana	Illinois Canada	0	0	0	0
WashU Grolars	Purdue C	0	10	0	10
Williams A	Amherst A	10	10	0	20
Williams B	Boston College A	10	0	0	10
Boston University A	Tufts B	0	0	0	0
Brandeis Mozart	Brown B	10	0	0	10
Tufts A	Dartmouth A	0	0	0	0
Dartmouth B	MIT A	10	10	0	20
Dartmouth C	MIT B	10	10	0	20
Amherst B	Southern Connecticut State University A	10	10	0	20
Boston College B	Tufts C	10	0	0	10
Vermont A	Brandeis Bach	0	0	0	0
Brown A	Vermont B	0	0	0	0
Brandeis Beethoven	Williams C	10	10	0	20
Alberta A	Washington Pink	10	10	0	20
Arizona State B	British Columbia C	0	0	0	0
British Columbia A	Washington Sockeye	10	0	0	10
Washington State	British Columbia B	0	0	0	0
Arizona State A	Texas	0	10	0	10
Washington Atlantic	Washington Masu	10	10	0	20
Washington Chinook	Alberta B	0	0	0	0
Washington Chum	Washington Steelhead	10	10	0	20
Washington Coho	Boise State	10	0	0	10
Georgia Tech F	Auburn A	10	10	0	20
Georgia Tech B	Emory A	10	10	0	20
Vanderbilt A	Georgia Tech A	10	0	0	10
Alabama A	Georgia Tech C	0	0	0	0
Clemson C	Georgia Tech D	10	0	0	10
Tennessee Tech	Georgia Tech E	0	0	0	0
Mississippi State A	Auburn C	0	10	0	10
Georgia A	Auburn B	10	10	0	20
Clemson B	Sewanne	10	10	0	20
Chipola College	South Carolina A	10	10	0	20
Clemson A	Tennessee A	10	0	0	10
Vanderbilt C	Vanderbilt B	0	0	0	0
Edinburgh B	Edinburgh C	0	10	0	10
Edinburgh A	Edinburgh D	0	0	0	0
Sheffield A	Sheffield B	0	10	0	10
Durham B	York	10	10	0	20
Bristol	Oxford	10	0	0	10
Cambridge B	Cambridge A	10	10	0	20
Birmingham	Cambridge D	0	0	0	0
Imperial B	Imperial A	0	10	0	10
Imperial C	Imperial D	10	0	0	10
Cambridge E	LSE	10	10	0	20
Cardiff	Southampton	10	10	0	20
Warwick	Cambridge C	0	10	0	10
Durham A	Durham C	10	10	0	20
Binghamton A	RIT A	10	0	0	10
Cornell D	Binghamton B	10	10	0	20
ESF	Binghamton C	10	0	0	10
Cornell C	Cornell B	10	0	0	10
RIT B	Cornell A	10	0	0	10
Ohio State B	Louisville B	10	10	0	20