What precipitates with barium?

Barium (Ba) can form precipitates with various anions when barium salts are mixed in solution. Some common precipitates that occur with barium include:

1. Barium sulfate (BaSO₄): 
This is a white precipitate formed when barium ions react with sulfate ions. It is highly insoluble in water and is often used in medical imaging.

2. Barium carbonate (BaCO₃): 
This white precipitate forms when barium ions react with carbonate ions. It is also insoluble in water.

3. Barium phosphate (Ba₃(PO₄)₂): 
This compound precipitates when barium ions come into contact with phosphate ions.

4. Barium chromate (BaCrO₄): 
Barium chromate precipitates as a yellow solid when barium ions interact with chromate ions.

5. Barium hydroxide (Ba(OH)₂): 
While barium hydroxide is soluble in water, it can precipitate in concentrated solutions or under certain conditions.

6. Barium sulfide (BaS): 
This salt may precipitate when barium ions react with sulfide ions.

When working with barium and its compounds, it's important to consider the solubility rules and the specific conditions of the reaction, such as pH and concentration of reactants.