What ions, atoms, or molecules are present when the following substances are mix

Question

What ions, atoms, or molecules are present when the following substances are mixed with water? Write a balanced equation to represent the process of dissolving each substance in water. Al (NO3)3(s);                                                                                                                                                                                                                                                              NaBr (s);                                                                                                                                                                                                                                                                  Potassium sulfate KSO4 (s)

Rb2O2 (s)                                                                                                                                                                                                                                                                                

Explanation / Answer

Al(NO3)3 --> Al+3 + NO3-
so, when Al(NO3)3 is dissolve in water it give Al+3 and NO3-

NaBr --> Na+ + Br-
so, when NaBr is dissolve in water it give Na+ and Br-

Rb2O2 --> 2Rb+ + 2O-
so, when Rb2O2 is dissolve in water it give Rb+ and O-

Potassium sulfate is K2SO4
K2SO4 --> K+ + SO4-2
so, when K2SO4 is dissolve in water it give K+ and SO4-2

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