Question

solubility curve
which substance is the most soluble at 70 c?
a nano3
b cscl
c licl
d nac2h3o2
part d
which of the compounds below has a solubility that decreases as the
temperature rises?
a nacl
b nac2h3o2
c so2
d nano3
part e

Explanation:

Part C

To determine the most soluble substance at \(70^{\circ}C\), we look at the solubility values (y - axis) for each substance at \(x = 70^{\circ}C\) on the solubility curve. The higher the y - value (solubility in g per 100 g of \(H_2O\)) at \(70^{\circ}C\), the more soluble the substance.
For \(NaNO_3\), \(CsCl\), \(LiCl\), and \(NaC_2H_3O_2\), by observing the curve:

• Locate \(x = 70^{\circ}C\) on the x - axis.
• Then check the y - values for each substance's curve at that x - value. The \(NaNO_3\) curve has the highest y - value at \(70^{\circ}C\).

For gases (\(SO_2\) is a gas), as temperature rises, the solubility of gases in liquids (in this case, water) generally decreases. This is because an increase in temperature gives gas molecules more kinetic energy to escape from the liquid - gas solution.
For solids (\(NaCl\), \(NaC_2H_3O_2\), \(NaNO_3\)), for most solids, as temperature increases, the solubility increases (the curves for these solids in the solubility curve have a positive slope). But for \(SO_2\) (a gas), the curve has a negative slope (solubility decreases as temperature increases).

Answer:

A. \(NaNO_3\)

Part D