Question

1. use the solubility table and classify each compound as water soluble or water insoluble.

agno₃
k₂so₄
cu(oh)₂
ni(no₃)₂

Explanation:

• For \(AgNO_3\): Nitrates (\(NO_3^-\)) are generally soluble in water. So, \(AgNO_3\) is water - soluble.
• For \(K_2SO_4\): Potassium salts (\(K^+\)) are soluble. Also, most sulfates (\(SO_4^{2 - }\)) are soluble (exceptions are \(BaSO_4\), \(PbSO_4\), \(CaSO_4\) (slightly soluble)). So, \(K_2SO_4\) is water - soluble.
• For \(Cu(OH)_2\): Hydroxides (\(OH^-\)) are generally insoluble. Exceptions are hydroxides of Group 1 metals (e.g., \(NaOH\), \(KOH\)) and \(Ba(OH)_2\). So, \(Cu(OH)_2\) is water - insoluble.
• For \(Ni(NO_3)_2\): Nitrates (\(NO_3^-\)) are generally soluble in water. So, \(Ni(NO_3)_2\) is water - soluble.

Answer:

• \(AgNO_3\): Water soluble
• \(K_2SO_4\): Water soluble
• \(Cu(OH)_2\): Water insoluble
• \(Ni(NO_3)_2\): Water soluble