Question

Use the iupac nomenclature rules to give the name for this comping CaOh)2

Answer 1

By criss crossing the charge numbers we find the chemical formula of a compound

For example Aluminium chloride

Al has
`3^+` charge and Cl has
`1^-` charge

3 becomes the subscript of Cl and 1 becomes the subscript of Al

So the chemical formula will be
`Al_1 Cl_3`

Ionic compounds are named using format as follows

Metal’s name + root word of the non metal + ide ending (when the metal has only one type of charge)

Example NaCl is named as Sodium + chlor + ide = Sodium chloride

Metal’s name + charge in roman numeral + root word of non metal + ide ending (when the metal possess more than one type of charge)

Example

`FeCl_2` is named as Iron+(II)+chlor+ide =Iron(II)chloride

`FeCl_3` is named as Iron+(III)+chlor+ide =Iron(III)chloride

From the formula CuO we get to know the charge numbers of Cu is
`2^+` and O is
`2^-`

CuO is Copper (II) oxide

Metal + roman numeral for charge + root word of non metal + ide ending used in this

It is an ionic compound since it has a metal and a non metal.

When there is a polyatomic ion present for example
`Na_3 PO_4` the name of the polyatomic ion is used as it is instead of ’ide’ ending

Thus
`Na_3 PO_4` is Sodium phosphate

`Ca(OH)_2`

Ca possess only one type of charge that is 2+ .So we don’t use roman numeral for the metal.

`OH^-` is Hydroxide ion and it is a polyatomic ion

So the name of the compound is Calcium hydroxide