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Lesson 2: Qualitative Analysis of Basic Radicals (Cations) — Picture questions (exam style)

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1.
NH₃(aq) was added to an unknown salt solution: blue ppt dissolving in excess to a deep-blue solution. Which cation is present?
NH₃(aq) was added to an unknown salt solution: blue ppt dissolving in excess to a deep-blue solution. Which cation is present?
Cu2+
Mg2+
Zn2+
Fe3+
2.
What is observed when NH₃(aq) is added to a solution of Fe2+ (diagram)?
What is observed when NH₃(aq) is added to a solution of Fe²⁺ (diagram)?
green ppt insoluble in excess
no ppt
red-brown ppt insoluble in excess
brown ppt soluble in excess
3.
Just enough NaOH(aq) is added to a solution containing 3.5 g of MgCl₂, precipitating Mg(OH)₂ as shown. What mass of precipitate forms?
Just enough NaOH(aq) is added to a solution containing 3.5 g of MgCl₂, precipitating Mg(OH)₂ as shown. What mass of precipitate forms?
5.73 g
4.27 g
2.14 g
3.50 g
4.
Just enough NaOH(aq) is added to a solution containing 9.75 g of ZnSO₄, precipitating Zn(OH)₂ as shown. What mass of precipitate forms?
Just enough NaOH(aq) is added to a solution containing 9.75 g of ZnSO₄, precipitating Zn(OH)₂ as shown. What mass of precipitate forms?
9.75 g
15.9 g
6.00 g
12.0 g
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