Question

calculate the no of moles and amount of NaOH in grams in 250ml of 0.1 molar NaOH solution?​

Answer 1

Explanation:

To calculate this use the following equation:

M*V=moles

where M is the molarity or mol/L and V is the volume in liters. Given the amounts in the question the molarity will be 0.1 M, the volume will be 250 mL or 0.25 L. So, the number of moles needed will be:

0.1 moles/L * 0.25 L = 0.025 moles

The molecular weight of NaOH is 23+17 = 40 g/mole so the amount needed is

0.025 moles * 40 g/mole of NaOH = 1g of NaOH

To make 250 ml of 0.1 M NaOH, you dissolve 1 gram NaOH in enough water to make a final volume of 250 mls.