1. Potassium Sulfate and Barium Nitrate. 2. Hydrochloric Acid and Silver Nitrate

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Thinks about the precipitation reactions (solubility rules). So, they mix two reagents together. These ionize in water, and ifthey meet up with something that would form a combination that isnot soluble in water, they precipitate out. Essentially, looking for change in state. Anything that is involvedin the reaction. A common indicator is a change in state (aqueous--> solid most often) Spectator ions (ions not involved in reaction, not included) so 1. K2SO4+Ba(NO3)2So combinations would either beK with NO3 or Ba with SO4 --> From solubility rules, know that BaSO4 is not soluble(K+ and NO3- = spectator ions) So net ionic would be only the active participants. Ba2+(aq) +SO42-(aq) --> BaSO4(s) 2. HCl + AgNO3 Halides not soluble with silver, lead(ii), and mercury(i).(HNO3 is strong acid, so fully ionizes in water.) so Ag+(aq) + Cl-(aq)--> AgCl(s) 3. HCl + KOH Water is formed. K+ and Cl- spectatorions. H+(aq) + OH-(aq) -->H2O (l)

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