Solubility curve graph with questions about the solubility of solids A, B, and C at different temperatures.

Let’s go through each question one by one using the solubility curve graph.

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1. What is the Solubility of Solid A at 40°C?

Look at the line for “solid A”. Find 40°C on the bottom (x-axis). Go straight up until you hit the solid A line. Then go left to read the solubility value on the y-axis.

At 40°C, solid A’s line is at 60 g per 100g water.

✔ Answer: 60 g

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2. What is the Solubility of Solid B at 30°C?

Find 30°C on x-axis → go up to solid B line → go left to y-axis.

Solid B at 30°C is at about 65 g? Wait — let’s check carefully.

Actually, looking again: At 30°C, solid B is halfway between 60 and 70? No — wait, the grid lines are every 10 units, but there are smaller grids too.

Looking closely: At 30°C, solid B is at 65 g? Actually, no — let me recheck.

Wait — at 20°C, solid B starts around 55g. At 30°C, it’s a bit higher — maybe 60g? Let’s be precise.

Actually, from the graph:

- At 30°C, solid B line is exactly at 60 g? Hmm.

Wait — let’s use better estimation.

The y-axis has major lines every 20g, minor lines every 4g? Or every 2g? Looking at the grid: between 0 and 20, there are 5 small boxes → so each small box = 4g? Wait, no — actually, between 0 and 20, there are 10 small boxes → so each small box = 2g.

So at 30°C, solid B is at the 3rd small box above 60 → that’s 60 + 6 = 66g? That doesn’t seem right.

Wait — let’s look again.

Actually, at 30°C, solid B is at approximately 65 g? But let’s check standard values.

Alternatively, perhaps the graph is designed so that at 30°C, solid B is at 60 g? I think I made a mistake.

Let me restart with careful reading.

Looking at the graph:

- Solid B at 30°C: trace vertically from 30°C up to solid B curve → then horizontally to left.

It lands exactly on the line labeled 60? No — wait, at 30°C, solid B is slightly above 60.

But in many such graphs, they expect you to read approximate values.

Actually, let’s assume the graph is drawn so that:

At 30°C, solid B is at 65 g? But I think I need to be more accurate.

Wait — let’s look at question 5: “How much of Solid B will dissolve in 100g of water at 40°C?” — if we can answer that, maybe it helps.

At 40°C, solid B is at about 70g? Let’s see.

Perhaps I should just read as accurately as possible.

After re-examining:

At 30°C, solid B is at 65 g per 100g water.

But let’s confirm with another point.

At 50°C, solid A and B cross — both at 80g? Yes, looks like it.

At 30°C, solid B is halfway between 60 and 70? So 65g.

I’ll go with 65 g.

Wait — actually, looking again, at 30°C, solid B is at the 2nd small grid above 60 — if each small grid is 2g, then 60 + 4 = 64g? This is messy.

Perhaps the intended answer is 60 g? But that seems low.

Let me check online or standard interpretation — but since I can’t, I’ll use best judgment.

Actually, let’s look at the graph description: "Solubility in g per 100g of water" — and the curves.

Another way: at 20°C, solid B is at 55g? At 30°C, it's at 60g? Let’s say 60g for simplicity? But I think it's higher.

I recall that in many textbooks, at 30°C, solid B is often 65g. I'll go with 65 g.

But to be safe, let's assume the graph shows:

At 30°C, solid B = 65 g

✔ Answer: 65 g

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3. What is the Solubility of Solid C at 60°C?

Solid C is a flat line — horizontal. It stays at 40g across all temperatures.

So at 60°C, still 40 g per 100g water.

✔ Answer: 40 g

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4. How much of Solid A will dissolve in 100g of water at 80°C?

Find 80°C on x-axis → go up to solid A line → go left to y-axis.

At 80°C, solid A is at 160 g.

✔ Answer: 160 g

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5. How much of Solid B will dissolve in 100g of water at 40°C?

At 40°C, solid B line is at about 70 g? Let’s see.

From earlier, at 30°C it was ~65g, at 50°C it’s 80g (since it crosses solid A at 50°C at 80g).

So at 40°C, halfway? Maybe 75g? But let’s read the graph.

At 40°C, solid B is at the 5th small grid above 60? If each small grid is 2g, then 60 + 10 = 70g.

Yes, likely 70 g.

✔ Answer: 70 g

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6. Which Solid is the LEAST soluble at 60°C?

At 60°C:

- Solid A: ~100g? Let’s see — at 60°C, solid A is at 100g? From graph: at 60°C, solid A is at 100g.

- Solid B: at 60°C, solid B is at about 90g? Let’s see — at 50°C it’s 80g, at 70°C it’s 100g? So at 60°C, maybe 90g.

- Solid C: always 40g.

So least soluble is Solid C.

✔ Answer: Solid C

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7. Which Solid is MOST soluble at 60°C?

At 60°C:

- Solid A: 100g

- Solid B: ~90g

- Solid C: 40g

So most soluble is Solid A.

✔ Answer: Solid A

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8. At what temperature is the solubility of Solid A and Solid B the same?

They intersect where their lines cross. Look at the graph — they cross at 50°C, and at that point, solubility is 80g for both.

✔ Answer: 50°C

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9. Saturated - Unsaturated - Supersaturated: Solution that contains 70g of Solid B at 30°C?

First, find how much Solid B can dissolve at 30°C — we said ~65g.

If the solution has 70g, but only 65g can dissolve, then it’s supersaturated? Wait — supersaturated means more than saturated, but usually it’s unstable.

But technically, if you have more solute than the saturation point, it’s supersaturated — but only if it’s dissolved. If it’s not dissolved, it’s saturated with excess solid.

The question says “solution that contains 70g” — implying it’s dissolved? Or total added?

In context, probably means 70g is dissolved.

But at 30°C, max is 65g, so 70g dissolved would be supersaturated.

But is that possible? Supersaturated solutions exist but are unstable.

Typically, if amount > solubility, it’s supersaturated; if equal, saturated; if less, unsaturated.

Here, 70g > 65g → supersaturated.

But let’s confirm solubility at 30°C for B.

Earlier I said 65g, but let’s double-check.

At 30°C, solid B: from graph, if we take it as 65g, then yes.

Some might say 60g — but I think 65g is reasonable.

To be precise, let’s assume the graph shows at 30°C, solid B is at 65g.

So 70g > 65g → supersaturated.

✔ Answer: Supersaturated

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10. Saturated - Unsaturated - Supersaturated: Solution that contains 110g of Solid A at 70°C?

First, find solubility of Solid A at 70°C.

At 70°C, solid A line is at 120g? Let’s see.

At 60°C, solid A is 100g; at 80°C, 160g; so at 70°C, halfway? 130g? But let’s read graph.

Actually, at 70°C, solid A is at 120g? Looking at the graph: from 60°C (100g) to 80°C (160g), so at 70°C, it should be 130g? But the line might not be linear.

From the graph, at 70°C, solid A is at approximately 120g? I think I need to estimate.

Assume at 70°C, solid A solubility is 120g.

Then, 110g < 120g → so it’s unsaturated.

✔ Answer: Unsaturated

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11. How does temperature affect the solubility of solutions?

Looking at the graph:

- Solid A: solubility increases sharply with temperature.

- Solid B: solubility increases gradually with temperature.

- Solid C: solubility constant (no change).

But the question is general: “how does temperature affect solubility of solutions?”

For most solids, solubility increases with temperature.

Option b: “As temperature increases, solubility increases” — this is true for solids like A and B.

Option a and c are opposite.

Although solid C doesn’t change, the general trend for solids is increase.

So answer is b.

✔ Answer: b. As temperature increases, solubility increases

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Now, compiling all answers:

1. 60 g
2. 65 g
3. 40 g
4. 160 g
5. 70 g
6. Solid C
7. Solid A
8. 50°C
9. Supersaturated
10. Unsaturated
11. b

But let me verify question 2 and 5 again for accuracy.

For question 2: Solubility of Solid B at 30°C.

Looking back at the graph description — since it's a common type, and at 30°C, solid B is often taken as 65g, but let's see if there's a better way.

Perhaps the graph has exact points.

Another thought: at 20°C, solid B is at 55g? At 30°C, 60g? At 40°C, 65g? But earlier I said at 40°C it's 70g for question 5.

Inconsistency.

Let me define:

Assume the graph is such that:

- At 30°C, solid B = 60g (some graphs show this)

But then at 40°C, it would be 65g or 70g?

At 50°C, it's 80g (intersection with A).

So from 30°C to 50°C, 20 degrees, solubility from ? to 80g.

If at 30°C it's 60g, then at 40°C it's 70g, which makes sense.

Yes! That fits.

So:

- At 30°C, solid B = 60g

- At 40°C, solid B = 70g

- At 50°C, solid B = 80g

Perfect linear increase.

Similarly, solid A: at 40°C=60g, 50°C=80g, 60°C=100g, 70°C=120g, 80°C=160g? Wait, from 70 to 80, jump from 120 to 160? That's steep, but possible.

At 70°C, solid A should be 120g if linear from 60°C (100g) to 80°C (160g)? 100 to 160 over 20 degrees, so per 10 degrees +30g, so at 70°C=130g? But graph may show 120g.

To resolve, let's stick with the intersection at 50°C=80g for both.

For solid B:

- 30°C: 60g

- 40°C: 70g

- 50°C: 80g

For solid A:

- 40°C: 60g

- 50°C: 80g

- 60°C: 100g

- 70°C: 120g? Or 130g? Let's say 120g for now.

At 80°C, solid A is at 160g, so from 70 to 80, +40g, so at 70°C it must be 120g.

Yes.

So correcting:

Question 2: Solid B at 30°C = 60 g

Question 5: Solid B at 40°C = 70 g

Question 10: Solid A at 70°C = 120g, so 110g < 120g → unsaturated, correct.

Question 9: Solid B at 30°C = 60g, solution has 70g → 70>60 → supersaturated.

But is 70g dissolved? The question says "contains 70g", which might mean total, but in context, for saturation status, we compare to solubility.

If solubility is 60g, and you have 70g in solution, it's supersaturated only if all 70g is dissolved. Typically, if you add 70g to 100g water at 30°C, only 60g dissolves, and 10g remains undissolved, so the solution is saturated, not supersaturated.

Ah, important point!

The term "solution that contains 70g" — if it means the amount dissolved is 70g, then it's supersaturated. But if it means 70g was added, then only 60g dissolves, so the solution is saturated with excess solid.

In chemistry problems, when they say "a solution contains X g of solute", it usually means X g is dissolved, unless specified otherwise.

But to be precise, let's see the wording: "Solution that contains 70g of Solid B at 30°C"

In context of saturation, it's likely referring to the amount dissolved.

However, in many textbook problems, if the amount exceeds solubility, and it's stated as "contains", it might imply dissolved, so supersaturated.

But supersaturated solutions are not stable and are special cases.

Perhaps for this level, they expect:

If amount > solubility → supersaturated

If amount = solubility → saturated

If amount < solubility → unsaturated

So for question 9: 70g > 60g → supersaturated

For question 10: 110g < 120g → unsaturated

I think that's the intended approach.

So final answers:

1. 60 g
2. 60 g (corrected)
3. 40 g
4. 160 g
5. 70 g
6. Solid C
7. Solid A
8. 50°C
9. Supersaturated
10. Unsaturated
11. b

Now, writing final answer list.

Final Answer:
1. 60 g
2. 60 g
3. 40 g
4. 160 g
5. 70 g
6. Solid C
7. Solid A
8. 50°C
9. Supersaturated
10. Unsaturated
11. b