a. x;
PTHH : \(Fe_2(SO_4)_3\) + \(6NAOH\) → \(2Fe(OH)_3\)(r) + \(3Na_2SO_4\)
b. x;
PTHH: \(CuSO_4\) + \(2NaOH\) → \(Cu(OH)_2\)(r) + \(Na_2SO_4\)
( màu xanh)
c. 0.
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