Anaysis of a Penny wbether the following compounds are soluble (sol) or insolubl

Question

Anaysis of a Penny wbether the following compounds are soluble (sol) or insoluble (insof) in (b) Fe(C H3O2) (a) NH4C (c) Mg(NO) (e) BaSO4 ANSWERS (d) Ag (Caco, (h) AIPO 2. (a) com (e) neu 3. (a) a ga (d) an: 4. (a) (g 5. (a) col (g) CuCro 7. (a) 2. 4 Write a balanced chemical equation for each of the following reactions . Ha . Dis (a) potassium(s) + chlorine(g) potassium chloridels) b) calcium carbonate(s) calcium oxide(s) + carbon dioxide(g) (c) lithium metal(s) water(l) + lithium hydroxide(aq) + hydrogen(g) (d) lead(II) nitrate(aq) sodium iodide (aq) + lead(II) iodide(s) + sodium nitrate(aq) (e) acetic acid(aq) barium hydroxide(aq) + barium acetate(aq) + water(1) 5. (optional) A 1980 penny weignh the solution and 2.925 g of copper metal is produced. What electric current is passed through the sol is the percentage of copper in the 1980 penny? 1980 penny weighing 3.079 g reacts with nitric acid to give a blue solution. Am

Explanation / Answer

Solubility rules:

- Most alkali metal (group I metals) are always soluble

- Cations/Anions such as NH4+, HCO3-; ClO3-, NO3- are always soluble

- Most halides are soluble, F-,Cl-,Br-,I-, exceptions = Ag+, Hg2+2, Pb+2 compounds

- Most sulfates are soluble (SO4-2); exceptions = Ag+, Ca+2, Sr+2, Ba+2, Hg2+2, Pb+2 compounds

- In general (except all alkali metals) these ions will NOT be soluble: PO4-3, CrO4-2, S-2, CO3-2

a)

NH4Cl = ammonium ions are soluble always

b)

Fe(C2H3O2)3 = acetates are all soluble

c)

Mg(NO3)2 = Nitrate ions are soluble always

d)

AgI = silver halides are not soluble,

e)

BaSO4 = exception, sulfates of Barium are not soluble

f)

CaCO3 = Carbonates are mostly not soluble

g)

CuCrO4 = slightly soluble, transition metal + chromat eions ar enothat soluble

h)

AlPO4 = Phosphate are not likely to be soluble, therefre, this is not soluble

i)

ZnS = Sulfides are mostly not soluble

j)

Sr(OH)2 --> slightly soluble, dependso nconcentration, but will be considered "not soluble"

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