Chapter F, Problem D.21E

(a)

Interpretation Introduction

Interpretation:

Compound ${\text{Na}}_{\text{2}}{\text{SO}}_{\text{3}}$ has to be named.

Concept Introduction:

Ionic compounds are named considering the cation and anion present in it.  The cation part is written first followed by the anion part.

Rules for naming ionic compounds:

• The cation and anion present in the ionic compound has to be identified.  Oxidation number of the cation has to be decided in order to cancel the charge of the negative anions.
• Cation is named first.  In case, if the metal belongs to transition metals, then the oxidation number is shown using Roman numeral and entered in parenthesis.
• Anion has to be named next.  If monoatomic anion is present, then the element name is ended with –ide.  If an oxoanion is present then suffix –ate is added for the ion that has large number of oxygen atoms and suffix –ite is added for the ion that has less number of oxygen atoms.  If the element can form a series of four oxoanions, then for the oxoanion having the less number of oxygen atoms, prefix hypo- is added and prefix per- is added if the oxoanion contains highest number of oxygen atoms.
• If water molecule is present in the formula of the ionic compound, then the word hydrate is added along with the Greek prefix that correspond to the number of water molecules present in it.

(b)

Interpretation Introduction

Interpretation:

Compound ${\text{Fe}}_{\text{2}}{\text{O}}_{\text{3}}$ has to be named.

Concept Introduction:

Refer part (a).

(c)

Interpretation Introduction

Interpretation:

Compound $\text{FeO}$ has to be named.

Concept Introduction:

Refer part (a).

(d)

Interpretation Introduction

Interpretation:

Compound ${\text{Mg(OH)}}_{\text{2}}$ has to be named.

Concept Introduction:

Refer part (a).

(e)

Interpretation Introduction

Interpretation:

Compound ${\text{NiSO}}_{\text{4}}\cdot {\text{6H}}_{\text{2}}\text{O}$ has to be named.

Concept Introduction:

Refer part (a).

(f)

Interpretation Introduction

Interpretation:

Compound ${\text{PCl}}_{\text{5}}$ has to be named.

Concept Introduction:

Binary molecular compounds are named by using the elements present in it and the number of atoms present in a molecule.

Rules for naming molecular compounds:

• First element name is written as such that is followed by the name of the second element in which the suffix is changed to –ide.
• Greek prefixes are used to indicate the number of atoms of each element that is present.  Generally prefix mono- is ignored.

(g)

Interpretation Introduction

Interpretation:

Compound ${\text{Cr(H}}_{\text{2}}{\text{PO}}_{\text{4}}{\text{)}}_{\text{3}}$ has to be named.

Concept Introduction:

Refer part (a).

(h)

Interpretation Introduction

Interpretation:

Compound ${\text{As}}_{\text{2}}{\text{O}}_{\text{3}}$ has to be named.

Concept Introduction:

Refer part (a).

(i)

Interpretation Introduction

Interpretation:

Compound ${\text{RuCl}}_{\text{2}}$ has to be named.

Concept Introduction:

Refer part (a).