Hello Rahul,

To calculate the molarity of the NaOH solution, follow these steps:

1. Given Data :

   • Mass of NaOH = 1 mg

   • Volume of NaOH solution = 250 mL
     
     

2. Convert Mass to Grams : Since 1 mg = 0.001 g, the mass of NaOH is 0.001 g.
   
   

3. Convert Volume to Liters : Volume is given in mL, so convert it to liters: 250 mL = 0.250 L.
   
   

4. Molar Mass of NaOH : The molar mass of NaOH (Na = 23, O = 16, H = 1) is 40 g/mol.
   
   

5. Calculate Moles of NaOH : Moles of NaOH = Mass of NaOH (in grams) / Molar mass of NaOH
   
   

6. Calculate Molarity : Molarity (M) = Moles of solute / Volume of solution (in liters)
   
   

7. So, the molarity of the NaOH solution is 0.0001 M . This indicates a very dilute solution of NaOH.
   
   
   

   I hope this answer helps you. If you have more queries, then feel free to share your questions with us, we will be happy to assist you.

   Thank you, and I wish you all the best in your bright future.