Predict the reaction, if any, which would occur if AgNO3 and KBr were mixed. Would any reaction occur if HNO3 was added?
Thanks!
AgNO3(aq) + KBr(aq) ==> AgBr(s) + NaBr(aq)
Adding HNO3 has no effect.
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To predict the reaction between AgNO3 and KBr, we can use the concept of solubility rules.
First, let's determine the solubility of AgNO3 and KBr in water. AgNO3 is a soluble salt, which means it dissociates completely into its ions (Ag+ and NO3-) in water. KBr is also a soluble salt, and it dissociates into its ions (K+ and Br-) in water.
When we mix AgNO3 and KBr, the Ag+ ions from AgNO3 and the Br- ions from KBr could potentially form a precipitate, since AgBr is insoluble in water according to the solubility rules.
So, the chemical equation for the reaction would be:
AgNO3 + KBr -> AgBr + KNO3
However, before we conclude that a reaction will occur, we need to check if there are any other possible reactions. Now, let's consider the addition of HNO3.
HNO3 is a strong acid and can react with the KBr. The acid-base reaction between HNO3 and KBr results in the formation of HBr, a strong acid.
The balanced equation for the reaction between HNO3 and KBr is:
HNO3 + KBr -> HBr + KNO3
Since the product HBr is a strong acid, it will immediately dissociate into ions (H+ and Br-) in water. Therefore, when HNO3 is added, the Br- ions from KBr will not be available to react with Ag+ ions, and the formation of AgBr precipitate will be hindered.
In conclusion, when AgNO3 and KBr are mixed, a reaction will occur, resulting in the formation of a precipitate (AgBr). However, if HNO3 is added to the mixture, the reaction between KBr and HNO3 will take place first, preventing the formation of AgBr precipitate.