Why Do KNO3, BaCl2, Na2SO4, and KCl Solutions Show No Reaction?

[textbooks]

can you just tell me why KNO3 (aq) and BaCl2 (aq) & Na2SO4 (aq) and KCl (aq) have no chemical change? Why is there no reaction between these?

 

[Char. Limit]

One possibility is that they are all in aqueous solution, so nothing really happens. They just float around in ionized form.

However, I think that BaSO₄ would precipitate out...

 

[Borek]

can you just tell me why KNO3 (aq) and BaCl2 (aq) & Na2SO4 (aq) and KCl (aq) have no chemical change? Why is there no reaction between these?

Do you mean all four in the solution at the same time?

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methods