Question

How many grams of $NaOH$ will be required to prepare $500g$ solution containing $10$% $\frac{w}{w}NaOH$ solution?

• A. $100g$
• B. $50g$
• C. $0.5g$
• D. $5.0g$

Answer 1

Answer: (B)

$50g$

In $500g$ of solution of 10% w/w $NaOH$ present.

Mass of the solute $=\frac{10\times 500}{100}=50g$

So, $50g$ of $NaOH$ will be required to prepare $500g$ of $10$% $\frac{w}{w}NaOH$ solution.