To make 1 L of NaCl solution where 20 mL diluted to 100 mL gives 0.9% text w/v , how many 2.25 g NaCl tablets are required?

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OPRA Medicinal Chemistry and Biopharmaceutics QUESTION #3823

Question 1

To make $1$ L of NaCl solution where $20$ mL diluted to $100$ mL gives $0.9\%\ \text{w/v}$, how many $2.25$ g NaCl tablets are required?

$4.5$
$9$
$20$✔️
$45$

Correct Answer Explanation

Required stock concentration: $0.9\% \times \dfrac{100}{20} = 4.5\%\ \text{w/v}$. Total NaCl for $1$ L $= 45$ g. Number of $2.25$ g tablets $= \dfrac{45}{2.25} = 20$ tablets.

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