Question

The molarity of an aqueous solution containing 0.4g of NaOH (molar mass=40g/mol) in 250mL of a solution is

• A. 0.04M
• B. 0.02M
• C. 0.20M
• D. 0.40M
• E. 0.08M

Hint:

For common volumes like \(250 \text{ mL}\), \(500 \text{ mL}\), or \(100 \text{ mL}\), think of them as fractions of a liter (\(1/4\), \(1/2\), \(1/10\)).
Multiply the moles by the reciprocal of the fraction (e.g., \(\times 4\) for \(250 \text{ mL}\)) to get the molarity quickly.

Answer 1

The Correct Option is A