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Precipitation Reactions. Graphic: Wikimedia Commons User Tubifex. Double Replacement Reactions. The ions of two compounds exchange places in an aqueous solution to form two new compounds. AX + BY  AY + BX. One of the compounds formed is usually a

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precipitation reactions

Precipitation Reactions

Graphic: Wikimedia Commons User Tubifex

double replacement reactions
Double Replacement Reactions

The ions of two compounds exchange places in an aqueous solution to form two new compounds.

AX + BY  AY + BX

One of the compounds formed is usually a

precipitate (an insoluble solid), an insoluble gas that bubbles out of solution, or a molecular compound, usually water.

slide3

Double replacement forming a precipitate…

Lead(II) nitrate + potassium iodide  lead(II) iodide + potassium nitrate

Double replacement (ionic) equation

Pb(NO3)2(aq) + 2KI(aq)  PbI2(s) + 2KNO3(aq)

Complete ionic equation shows compounds as aqueous ions

Pb2+(aq) + 2 NO3-(aq) + 2 K+(aq) +2 I-(aq)  PbI2(s) + 2K+(aq) + 2 NO3-(aq)

Net ionic equation eliminates the spectator ions

Pb2+(aq) + 2 I-(aq)  PbI2(s)

solubility rules ap chemistry
Solubility Rules – AP Chemistry

All sodium, potassium, ammonium, and nitrate salts are soluble in water. Memorization of other “solubility rules” is beyond the scope of this course and the AP Exam.

Therefore, the following slides are only for your amusement, and will not be tested 

solubility chart common salts at 25 c
Solubility Chart:Common saltsat 25C

S = Soluble

I = Insoluble

P = Partially

Soluble

X = Other