the solubilities of three salts in water are shown in the graph. for each salt, determine how much will…

the solubilities of three salts in water are shown in the graph. for each salt, determine how much will remain undissolved if 300 g is mixed into a liter of pure water at 40 °c. one significant figure is sufficient in each answer.

the solubilities of three salts in water are shown in the graph. for each salt, determine how much will remain undissolved if 300 g is mixed into a liter of pure water at 40 °c. one significant figure is sufficient in each answer.

Answer

Explanation:

Step1: Read solubility from graph

From the graph, at 40°C, the solubility of $Pb(NO_3)_2$ is about 700 g/L, solubility of KI is about 400 g/L and solubility of $K_2Cr_2O_7$ is about 200 g/L.

Step2: Calculate undissolved amount for $Pb(NO_3)_2$

Since 700 g/L > 300 g/L, all 300 g of $Pb(NO_3)_2$ will dissolve. Undissolved amount = 0 g.

Step3: Calculate undissolved amount for KI

Amount added = 300 g, solubility = 400 g/L. All 300 g will dissolve. Undissolved amount = 0 g.

Step4: Calculate undissolved amount for $K_2Cr_2O_7$

Amount added = 300 g, solubility = 200 g/L. Undissolved amount = 300 - 200= 100 g.

Answer:

$Pb(NO_3)_2$: 0 g KI: 0 g $K_2Cr_2O_7$: 100 g