Question

3.56 gm of sodium hydroxide (molar mass=40) are dissolved in water and the solution is made to 100cm³ in a volumetric flask. Calculate the molarity of the solution​

Answer 1

Given:

• Mass of Solute (NaOH) = 3.56 gm

• Volume of solution = 100 cm³

• Molar mass of NaOH = 40 gm/mL

To Calculate:

• Molarity of the solution.

Formula to be applied:

• Moles = given mass/ molar mass

• Molarity of solution = (Moles of Solute/ Volume Of solution) × 1000

Solution:

⇒ moles of NaOH = 3.56/40 = 0.89

⇒ Molarity of solution = (0.89/100) × 1000

⇒ Molarity of solution = 0.89 × 10

∴ Molarity of solution = 8.9 M

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