Question

if 0.4 gram of NaOH is present in 40 ml of solution what is the molarity.

Answer 1

Answer:

The molarity of $NaOH$ is $0.25M$.

Explanation:

Before finding the molarity, we first calculate the moles of $NaOH$ present using the mole formula.  

$Moles= \frac{Mass}{Molar Mass}$

The mass of $NaOH$- 0.4g

The molar mass of $NaOH$- 40g/mol

$Moles= \frac{0.4}{40}$

$Moles= 0.01mol$

We can now calculate the molarity of $NaOH$ using-

$Molarity= \frac{Moles}{Volume}$

The moles of  $NaOH$- 0.01mol

The volume of the solution- 40ml = 0.04L

$Molarity= \frac{0.01}{0.04}$

$=0.25M$

Conclusion:

The molarity of  $NaOH$ in the 40ml solution will be $0.25M$.