Q20 / 60 · KVPY 2011 (SA) · Chemistry
The solubility curve of $\mathrm{KNO}_{3}$ in water is shown below.
The amount of $\mathrm{KNO}_{3}$ that dissolves in $50 \mathrm{~g}$ of water at $40^{\circ} \mathrm{C}$ is closest to
The amount of $\mathrm{KNO}_{3}$ that dissolves in $50 \mathrm{~g}$ of water at $40^{\circ} \mathrm{C}$ is closest to
- Correct answerA$100 \mathrm{~g}$
- B$150 \mathrm{~g}$
- C$200 \mathrm{~g}$
- D$50 \mathrm{~g}$
Solution
At $40^{\circ} \mathrm{C}$ solubility is $200 \mathrm{gm}$ per $100 \mathrm{ml}$ (approx)
i.e., $100 \mathrm{ml}$ of water contains $=200 \mathrm{gm}$ of $\mathrm{KNO}_{3}$ (approx)
$50 \mathrm{ml}$ of water contains $=100 \mathrm{gm}$ (approx)
Hence, the correct answer is option: 'A'.