Question

question 9
use the \solubility curves\ graph for various ionic compounds to answer the following questions:
a. what is the maximum mass of kbr that can dissolve in 100. g of water at 100 °c?
i. can you dissolve 100 g of kbr in 150 g of water at 100 °c?
∘ yes, will dissolve
∘ no, wont dissolve
b. what is the maximum mass of nullo₃ that can dissolve in 100. g of water at 100 °c?
i. can you dissolve 151 g of nullo₃ in 75 g of water at 100 °c?
∘ no, wont dissolve
∘ yes, will dissolve
(graph: solubility (g solute per 100 g h₂o) vs temperature (°c) with curves for sugar (c₁₂h₂₂o₁₁), kno₃, nullo₃, nullbr, kbr, kcl, nacl, ce₂(so₄)₃)
graph from openstax, chemistry 2e, access for free

Explanation:

Part A: Maximum mass of KBr in 100g water at 100°C

Step 1: Locate KBr on the solubility curve

Find the curve for KBr on the graph. At 100°C, check the solubility (g solute per 100g H₂O).

Step 2: Read the solubility value

From the graph, the solubility of KBr at 100°C is 100 g per 100g water (approximate, based on the curve). So maximum mass is 100 g.

Part A.i: Dissolve 100g KBr in 150g water at 100°C

Step 1: Calculate solubility for 150g water

If 100g water dissolves 100g KBr, then 150g water can dissolve \( \frac{100\ g\ KBr}{100\ g\ water} \times 150\ g\ water = 150\ g\ KBr \).

Step 2: Compare with 100g KBr

Since 100g < 150g, it will dissolve. So answer is "Yes, will dissolve".

Part B: Maximum mass of NaNO₃ in 100g water at 100°C

Step 1: Locate NaNO₃ on the curve

Find the NaNO₃ curve. At 100°C, its solubility is approximately 180 g per 100g water (from the graph).

Step 2: Read the value

So maximum mass is 180 g (approximate, based on the curve).

Part B.i: Dissolve 151g NaNO₃ in 75g water at 100°C

Step 1: Calculate solubility for 75g water

If 100g water dissolves 180g NaNO₃, then 75g water can dissolve \( \frac{180\ g\ NaNO_3}{100\ g\ water} \times 75\ g\ water = 135\ g\ NaNO_3 \).

Step 2: Compare with 151g

Since 151g > 135g, it won't dissolve. So answer is "No, won't dissolve".

Answer:

A. 100 g
A.i. Yes, will dissolve
B. 180 g (approximate, based on graph)
B.i. No, won't dissolve

(Note: The solubility values are approximate from the given graph. The exact values may vary slightly based on the graph's scale, but the method follows solubility curve interpretation.)