Question

Making solutions is an extremely important component to real-life chemistry. If you make 3.00 L of a solution using 90.0 g of sodium hydroxide, what is the final concentration?

Answer 1

Final concentration of NaOH = 0.75 M

Step-by-step explanation:

For
`NaOH` :-

Given mass = 90.0 g

Molar mass of NaOH = 39.997 g/mol

The formula for the calculation of moles is shown below:

`moles = (Mass\ taken)/(Molar\ mass)`

Thus,

`Moles= (90.0\ g)/(39.997\ g/mol)`

`Moles\ of\ NaOH= 2.2502\ mol`

Molarity is defined as the number of moles present in one liter of the solution. It is basically the ratio of the moles of the solute to the liters of the solution.

The expression for the molarity, according to its definition is shown below as:

`Molarity=(Moles\ of\ solute)/(Volume\ of\ the\ solution)`

Where, Volume must be in Liter.

It is denoted by M.

Given, Volume = 3.00 L

So,

`Molarity=(2.2502\ mol)/(3.00\ L)=0.75\ M`

Final concentration of NaOH = 0.75 M