Some copper(II) sulfate (CuSO4\text{CuSO}_4CuSO4) is dissolved in water to make a solution.
A reaction takes place when sodium hydroxide solution is added to a solution of copper(II) sulfate.
Complete the word equation to show this reaction:
sodium hydroxide\text{sodium hydroxide}sodium hydroxide + copper(II) sulfate\text{copper(II) sulfate}copper(II) sulfate ⟶\longrightarrow⟶ ‾\underline{\qquad\qquad\qquad\qquad} + ‾\underline{\qquad\qquad\qquad\qquad}
State what you would observe in this reaction.
Barium chloride is used to test for sulfate ions.
Barium chloride solution is added to another solution of copper(II) sulfate. A white precipitate forms. Identify the white precipitate.
In this test, another substance should be added to react with any carbonate ions that might be present. Identify this other substance and state one observation that would be made if carbonate ions were present.
A compound with the formula (NH4)2Cu(SO4)2(\text{NH}_4)_2\text{Cu}(\text{SO}_4)_2(NH4)2Cu(SO4)2 gives the same results in the tests in parts (a) and (b) as copper(II) sulfate (CuSO4\text{CuSO}_4CuSO4).
Describe how you could show that a solution of (NH4)2Cu(SO4)2(\text{NH}_4)_2\text{Cu}(\text{SO}_4)_2(NH4)2Cu(SO4)2 contains ammonium ions.
