How much sodium hydroxide is required to make 250 cm3 of 0.1 molar solution? Na=23; 0=16; H=1]
- 10.0 g
- 4.0g
- 2.0 g
-
1 .0g
- 0.1 g
The correct answer is: D
Explanation
no of moles of Na = molar concentration X volume
= 0.1 x \(\frac{250}{1000}\) = 0.025
no of moles = \(\frac{m}{M}\)
mass = no of mles x molar mass = 0.025 x 40 = 1.0g ( molar mass of NaOH = 40g/mol)