Question

A) A 25.3 mg sample of sodium carbonate is present in a container.

i) Write the formula of sodium carbonate:

Answer 1

Formula of sodium carbonate is
`Na_(2)CO_(3)`.

Step-by-step explanation:

Sodium carbonate is an ionic compound consists of
`Na^(+)` and
`CO_(3)^(2-)` ions.

In a formula unit of sodium carbonate, there should be two
`Na^(+)` ions and one
`CO_(3)^(2-)` ion to maintain charge neutrality.

In general, formula of an ionic compound consists of
`A^(x+)` and
`B^(y-)` ions is written as :
`A_(y)B_(x)` (
`x\\eq y`) and AB (
`x= y`)

If x or y is equal to 1 then it is not written explicitly in formula.

So, formula of sodium carbonate =
`Na_(2)CO_(3)`