Question

What is molarity of a solution containing 10 g of NaOH in 500 mL of NaOH solution?

Molar mass NaOH = 40 g/mol#

Answer 1

`"0.5 molar"`

Explanation:

Molarity is a concentration term in which the no. of moles and the volume are related.

`"Molarity" \ (c) = ("no. of moles" \ (n))/("volume in L" \ (V))`

Here

`n = "10 g"/"40 g/mol"`

`V = "500 mL"= "0.5 L"`

So

`c=n/V`

`= "10 g"/("40 g/mol" \ xx \ "0.5 L")`

`= "10 mol"/"20 L" = "0.5 molar"`