Question

day 2 – ionic names and formulas formative

1. name the following ionic compounds using their chemical formulas

ionic compound | ionic name
$\text{ag}_2\text{s}$
$\text{csf}$
$\text{cocl}_3$
$\text{mni}_2$
$\text{sr}_3(\text{po}_4)_2$
$\text{al}_2\text{o}_3$
$\text{pbi}_2$
$\text{ga}(\text{c}_2\text{h}_3\text{o}_2)_3$
$\text{hg}_2\text{o}$
$\text{scoh}$

Explanation:

1. For ionic compounds, name the cation first, then the anion. For metals with multiple oxidation states, use a Roman numeral to indicate the cation's charge, calculated by balancing the anion's total charge. For polyatomic ions, use their standard names.
2. $Ag^+$ is silver (only +1 charge), $S^{2-}$ is sulfide.
3. $Cs^+$ is cesium (only +1 charge), $F^-$ is fluoride.
4. $Cl^-$ total charge is -3, so $Co$ is +3 (cobalt(III)), $Cl^-$ is chloride.
5. $I^-$ total charge is -2, so $Mn$ is +2 (manganese(II)), $I^-$ is iodide.
6. $Sr^{2+}$ is strontium (only +2 charge), $PO_4^{3-}$ is phosphate.
7. $Al^{3+}$ is aluminum (only +3 charge), $O^{2-}$ is oxide.
8. $I^-$ total charge is -2, so $Pb$ is +2 (lead(II)), $I^-$ is iodide.
9. $C_2H_3O_2^-$ total charge is -3, so $Ga$ is +3 (gallium(III)), $C_2H_3O_2^-$ is acetate.
10. $O^{2-}$ is -2, so each $Hg$ is +1 (mercury(I)), $O^{2-}$ is oxide.
11. $Sc^{3+}$ is scandium (only +3 charge), $OH^-$ is hydroxide.

Answer:

Ionic Compound	Ionic Name
$\text{CsF}$	Cesium fluoride
$\text{CoCl}_3$	Cobalt(III) chloride
$\text{MnI}_2$	Manganese(II) iodide
$\text{Sr}_3(\text{PO}_4)_2$	Strontium phosphate
$\text{Al}_2\text{O}_3$	Aluminum oxide
$\text{PbI}_2$	Lead(II) iodide
$\text{Ga}(\text{C}_2\text{H}_3\text{O}_2)_3$	Gallium(III) acetate
$\text{Hg}_2\text{O}$	Mercury(I) oxide
$\text{Sc(OH)}_3$ (corrected formula)	Scandium hydroxide