Answer:
Ag⁺, Ba²⁺,
Explanation:
We can solve this question using the <em>solubility rules:</em>
<em>When an Halide as Br- is added to a solution, the ions that can be precipitate are Ag⁺, Hg₂²⁺ and Pb²⁺.</em>
That means the first ion present is Ag⁺
<em>When sulfates, SO₄²⁻ are added, the ions that precipitates are: Ag⁺, Ca²⁺, Sr²⁺, Ba²⁺, Hg₂²⁺ and Pb²⁺</em>
The second ion present is Ba²⁺
Hydroxides of Cu²⁺ and Mn²⁺ are insolubles but as no precipitate are formed when the solution is strongly alkaline those ions are not present.
Answer:
A. 3NaOH(aq)+Fe(NO3)3(aq) ---> Fe(OH)3 (solid)+ 3NaNO3(aq)
B. Double replacement reaction
AB +CD ---> AD + CB
<span> There are 97.2 mol of O in 10.8 mol of Fe(NO3)3</span>