Question

calculate the molarity of sodiumhydrocside solution by desoving 4g sodiumhydrocside in water to form 250ml solution .
......fast its argent..........

Answer 1

Molarity = Number of moles of solute / Volume of solution in liters

Number of moles of solute = Given mass / Molar mass

Given mass = 4 g

Molar mass of solute = NaOH = 23 + 16 + 1 = 40 g

Number of moles = 4 g / 40 g = 0.1 mole

Volume of solution = 250 ml = 0.25 liters

=> Molarity = 0.1 / 0.25 = 100 / 25 = 0.4 M

Hence molarity of that solution is 0.4 M.