Question

The solubility curve of $KN{O}_3$ in water is shown below.
The amount of $KN{O}_3$ that dissolves in $50g$ of water at $40$ is closest to:

• A. $100g$
• B. $150g$
• C. $200g$
• D. $50g$

Answer 1

The correct option is A $100g$

The amount of $KN{O}_3$ that dissolves in 50 g of water at ${40}^{o}C$ is closest to 100 g.
At ${40}^{o}C$, the solubility is approximately 200 g $KN{O}_3$ into 100 g water.
So 50 g of water at ${40}^{o}C$ will dissolve around 100 g of $KN{O}_3$.