Worksheet for determining pH using cabbage indicator with a pH scale and household substances.

Let’s work through this step by step.

We are using cabbage indicator (which changes color based on pH) to estimate the pH of household substances. The first part gives us a reference chart:

| pH | 2 | 5 | 7 | 8 | 11 | 14 |
|-----|---------|----------|-------|-----------|-------------|--------------|
| Color | Lemon | Vinegar | Water | Baking Soda | Washing Soda | Drain Cleaner |

Actually, looking at the table again — it seems like the “Color” row is showing *examples* of substances that match those pH levels, not actual colors. But in real cabbage indicator experiments, we know:

- Red/pink = acidic (low pH)
- Purple = neutral (pH 7)
- Blue/green = basic (high pH)
- Yellow/green = very basic

But since the worksheet doesn’t show actual colors — just pictures of bottles and lemons under each pH number — we have to assume that the student is supposed to compare the color their cabbage juice turns when mixed with each substance to the closest matching example in Part 1.

So for Part 2, we need to fill in:

For each substance tested (like lemon juice, vinegar, water, etc.), record:
- What color the cabbage indicator turned
- Estimate the pH by comparing to Part 1
- Then look up or research the actual pH (we can do that from known science facts)

Since no actual lab was done here, I’ll use standard known values for common household items and match them to the closest pH in Part 1.

Let’s go substance by substance.

---

Common household substances and their typical pH:

1. Lemon Juice → Very acidic → pH ~2
→ Matches “Lemon” in Part 1 → Estimated pH: 2
→ Actual pH researched: 2.0–2.6 → We’ll say 2.3

2. Vinegar → Acidic → pH ~3
→ Closest in Part 1 is pH 5? Wait — that doesn’t match. Hmm.

Wait — let’s re-examine Part 1.

The table says:

pH 2 → Lemon
pH 5 → Vinegar
pH 7 → Water
pH 8 → Baking Soda
pH 11 → Washing Soda
pH 14 → Drain Cleaner

This suggests that according to this worksheet’s baseline, vinegar is assigned pH 5 — but actually, white vinegar is around pH 2.5–3. So there might be an error in the worksheet’s labeling? Or maybe they’re using a different type?

Actually — perhaps the images under each pH are meant to represent what the cabbage indicator looks like at that pH? For example, maybe the lemon image represents red color (acid), vinegar image represents orange-red, water = purple, baking soda = blue-green, washing soda = green-yellow, drain cleaner = yellow.

That makes more sense! In reality:

Cabbage indicator colors:

- pH 2: Bright red
- pH 4: Pinkish-red
- pH 6: Light pink
- pH 7: Purple
- pH 8: Blue
- pH 10: Green-blue
- pH 12: Green
- pH 14: Yellow-green

So if we map the examples given:

- Lemon (pH 2) → Red
- Vinegar (pH 5) → Maybe light pink? But vinegar is usually pH 3 — so maybe the worksheet has a mistake? Or perhaps they mean apple cider vinegar which can be less acidic? Unlikely.

Alternatively — maybe the numbers above the images are the pH values, and the images are just labels for what you’d test. That must be it.

Looking again: The header says “Using Cabbage Indicator to Determine pH”

Part 1: “Determine a pH Baseline Scale”

It shows:

Under pH 2 → picture of lemon
Under pH 5 → picture of vinegar bottle
Under pH 7 → water bottle
Under pH 8 → baking soda box
Under pH 11 → washing soda box
Under pH 14 → drain cleaner bottle

So these are EXAMPLES of substances that SHOULD give approximately those pH values when tested with cabbage indicator.

Therefore, for Part 2, when you test a substance, you compare its cabbage-indicator color to one of these reference colors (even though we don’t see the actual colors — we infer from context).

In practice, students would write down something like:

Substance: Lemon Juice
Color Indicator: Red
Estimated pH: 2 (matches lemon in Part 1)
Actual pH researched: 2.3

Substance: White Vinegar
Color Indicator: Light Red / Pink
Estimated pH: 5? But wait — that contradicts reality.

Hold on — perhaps the worksheet intends for us to use the labeled pH values as guides, even if scientifically inaccurate? That would be confusing.

Better approach: Use scientific knowledge to assign correct estimated pH based on where the color falls between the references.

Assume the color scale goes:

Red (pH 2) → Orange/Pink (pH 5) → Purple (pH 7) → Blue (pH 8) → Green (pH 11) → Yellow (pH 14)

Then:

- If cabbage turns RED → pH ≈ 2
- If PINK/ORANGE → pH ≈ 5
- If PURPLE → pH ≈ 7
- If BLUE → pH ≈ 8
- If GREEN → pH ≈ 11
- If YELLOW → pH ≈ 14

Now, for common substances:

1. Lemon Juice → Turns cabbage RED → Estimated pH: 2 → Actual: 2.3

2. White Vinegar → Turns cabbage ORANGE-PINK → Between 2 and 5? Closer to 3. But in Part 1, vinegar is listed under pH 5 — so maybe for this worksheet, we follow their mapping? That seems odd.

Perhaps the best way is to ignore the mislabeling and use real-world data.

I think the intended answer is to match the substance to the closest reference in Part 1 based on expected color change.

Let me list common substances and their real pH, then map to nearest in Part 1:

| Substance | Real pH | Nearest in Part 1 | Estimated pH |
|------------------|---------|-------------------|--------------|
| Lemon Juice | 2.3 | Lemon (pH 2) | 2 |
| White Vinegar | 2.9 | Lemon (pH 2) or Vinegar (pH 5)? → closer to 3, so maybe interpolate? But worksheet only has discrete points. Since 2.9 is closer to 3 than 5, but 3 isn't listed... Perhaps they expect vinegar to match pH 5? That doesn't make sense.

Wait — maybe the "Vinegar" under pH 5 is a typo? Because most vinegars are pH 2-3. Apple cider vinegar can be up to 3.5, still not 5.

Another possibility: The numbers 2,5,7,8,11,14 are the pH values, and the images below are just illustrations of what kind of substance might have that pH — not necessarily that vinegar IS pH 5.

Yes! That must be it. The image of vinegar is placed under pH 5 to suggest that some vinegars or diluted ones might read around there — but typically not.

To resolve this, I'll use standard educational expectations.

In many middle school labs, they teach:

- Lemon juice: pH 2
- Vinegar: pH 3
- Water: pH 7
- Baking soda solution: pH 9
- Ammonia/washing soda: pH 11
- Bleach/drain cleaner: pH 13-14

But in this worksheet, baking soda is under pH 8, washing soda under 11, drain cleaner under 14.

Baking soda (sodium bicarbonate) solution is actually about pH 8.3 — so pH 8 is reasonable.

Washing soda (sodium carbonate) is about pH 11 — good.

Drain cleaner (often sodium hydroxide) is pH 14 — good.

Water is pH 7 — good.

Lemon is pH 2 — good.

Vinegar — should be pH 3, but it's listed under pH 5. This is likely an error in the worksheet. However, for consistency with the worksheet's own baseline, if they put vinegar under pH 5, then when a student tests vinegar and sees a color similar to the "vinegar" reference, they should estimate pH 5.

But that would be scientifically inaccurate.

Given that this is a homework helper, I should provide accurate science while respecting the worksheet structure.

Best compromise: For Part 2, when estimating pH, use the color comparison to the references in Part 1, but for "Actual pH researched", use real values.

And for substances not listed, like milk or soap, we add them.

The worksheet doesn't specify which substances to test in Part 2 — it just has blank rows. So I need to choose common ones.

Typical substances tested in such labs:

- Lemon juice
- Vinegar
- Tap water
- Milk
- Baking soda solution
- Soap solution
- Ammonia or washing soda
- Bleach or drain cleaner

But since the worksheet has 6 references, probably test 6 substances.

Let’s assume the student tests:

1. Lemon Juice
2. Vinegar
3. Water
4. Baking Soda (solution)
5. Washing Soda (solution)
6. Drain Cleaner

For each, we can fill in.

Based on cabbage indicator color changes:

- Lemon Juice: Red → matches pH 2 reference → Estimated pH: 2 → Actual: 2.3
- Vinegar: Light Red/Pink → if we compare to references, it's between lemon (2) and vinegar (5) — but since vinegar is labeled as 5, and if the color is similar, estimate 5. But scientifically, it's 3. To avoid confusion, I'll use the worksheet's assignment for estimation, but correct actual value.

Actually, let's think differently. The instruction says: "Find similar shades on your baseline chart when making a decision of where it might fall on the pH scale."

So if the cabbage turns the same color as the "lemon" sample, estimate pH 2.

If same as "vinegar" sample, estimate pH 5, etc.

Even if scientifically vinegar is not pH 5, for this exercise, we go by the chart provided.

So for accuracy in education, I'll note that, but follow the worksheet.

Final decision:

For Part 2, I'll create a table with 6 common substances, estimate pH based on matching to Part 1 references, and provide actual researched pH.

Substances to test (common in such labs):

1. Lemon Juice
2. White Vinegar
3. Distilled Water
4. Baking Soda Solution (1 tsp in 1 cup water)
5. Washing Soda Solution (similar)
6. Household Drain Cleaner (diluted for safety)

Now, filling in:

Substance: Lemon Juice
Color Indicator: Red (same as lemon in Part 1)
Estimated pH: 2
Actual pH researched: 2.3

Substance: White Vinegar
Color Indicator: Light Red / Pink (assume it matches the "vinegar" reference in Part 1, which is labeled pH 5)
Estimated pH: 5
Actual pH researched: 2.9 (but we'll report 3.0 for simplicity)

Wait — this is problematic. If the cabbage indicator for vinegar turns a color that matches the "vinegar" image under pH 5, then estimated is 5, but actual is 3. That teaches wrong science.

Perhaps the "vinegar" under pH 5 is a mistake, and it should be under pH 3. But since we can't change the worksheet, and the user is to solve based on given info, I'll proceed with the worksheet's labeling for estimation, but correct actual values.

To make it educational, in the explanation, I can clarify.

But the rules say: do not describe the image, and provide final answer.

Also, the response format requires Final Answer after all reasoning.

Since ExplainAnswer is false, TeachTopic is false, GeneratePractice is false, I only need to provide Final Answer.

But what is the final answer? The worksheet has a table to fill out. Probably, the expected output is the completed table for Part 2.

Since no specific substances are given, I need to assume standard ones.

Perhaps the student is to test the same substances as in Part 1? But Part 1 is for calibration.

Looking back at the worksheet text:

"Part 2: Determine Approximate pH

Directions: Test various household substances to determine its approximate pH. Find similar shades on your baseline chart when making a decision of where it might fall on the pH scale. Record your results in the table below."

And the table has columns: Substance, Color Indicator, Estimated pH, Actual pH-researched

With 6 blank rows.

So I need to provide a completed table with 6 entries.

I'll choose:

1. Lemon Juice
2. White Vinegar
3. Tap Water
4. Baking Soda Solution
5. Liquid Hand Soap
6. Household Bleach (as proxy for drain cleaner)

Now, for each, based on cabbage indicator behavior and Part 1 references:

Recall Part 1 references:

- pH 2: Lemon → assume red color
- pH 5: Vinegar → assume orange-pink color
- pH 7: Water → purple
- pH 8: Baking Soda → blue
- pH 11: Washing Soda → green
- pH 14: Drain Cleaner → yellow

Real cabbage colors:

- pH 2: Red
- pH 4: Pink
- pH 6: Light purple
- pH 7: Purple
- pH 8: Blue
- pH 10: Blue-green
- pH 12: Green
- pH 14: Yellow

So mapping:

- Red → pH 2
- Pink → pH 4-5
- Purple → pH 7
- Blue → pH 8
- Green → pH 11-12
- Yellow → pH 14

For our substances:

1. Lemon Juice: Turns cabbage red → matches pH 2 reference → Estimated pH: 2 → Actual: 2.3

2. White Vinegar: Turns cabbage pink-orange → closest to pH 5 reference (since pH 4-5 is pink) → Estimated pH: 5 → Actual: 2.9 ≈ 3.0

3. Tap Water: Usually slightly basic due to minerals, but often close to 7. Turns cabbage purple → matches pH 7 → Estimated pH: 7 → Actual: 7.0 (for distilled; tap may be 7.5, but we'll use 7.0)

4. Baking Soda Solution: Turns cabbage blue → matches pH 8 reference → Estimated pH: 8 → Actual: 8.3 ≈ 8.3

5. Liquid Hand Soap: Typically basic, pH 9-10. Cabbage turns blue-green or green. Closest reference is pH 11 (washing soda) which is green, or pH 8 (blue). Since pH 9-10 is between, but worksheet has no 9 or 10, so if it's green, estimate pH 11; if blue, estimate pH 8. Most hand soaps are pH 9-10, cabbage might turn teal or light green. Let's say it matches closer to pH 8 or 11? Better to say if it's green, estimate 11. But scientifically, pH 9.5. To align with worksheet, if the color is similar to washing soda (pH 11), estimate 11. But that's high. Perhaps for soap, it's often tested as pH 9, so between 8 and 11. Since no intermediate, and if color is greenish, estimate 11. I'll assume for this exercise, hand soap turns cabbage green, so matches washing soda reference → Estimated pH: 11 → Actual: 9.5

6. Household Bleach: Strong base, pH 12-13. Cabbage turns yellow-green or yellow. Matches drain cleaner reference (pH 14) → Estimated pH: 14 → Actual: 12.5

This is messy because the worksheet's references are sparse.

To simplify and match typical school answers, I'll use:

| Substance | Color Indicator | Estimated pH | Actual pH-researched |
|-----------------------|-----------------|--------------|----------------------|
| Lemon Juice | Red | 2 | 2.3 |
| White Vinegar | Pink | 5 | 3.0 |
| Distilled Water | Purple | 7 | 7.0 |
| Baking Soda Solution | Blue | 8 | 8.3 |
| Washing Soda Solution | Green | 11 | 11.0 |
| Drain Cleaner | Yellow | 14 | 14.0 |

Note: For vinegar, estimated pH is 5 per worksheet reference, but actual is 3.0 — this highlights that the baseline might have inaccuracies, but for the exercise, we follow the chart.

In reality, vinegar should be closer to pH 3, so if the cabbage turns a color between lemon (2) and vinegar (5), you might estimate 3 or 4, but since the worksheet only has those points, and vinegar is labeled as 5, we use that.

For the purpose of this task, I'll go with the above table.

Final Answer will be the completed table.

Since the response format requires Final Answer after reasoning, and no other sections, I'll box the table.

But how to present it? As text.

Also, ensure calculations are verified.

Verified:

- Lemon juice pH: 2-3, commonly 2.3 — ok
- Vinegar: acetic acid, 5% solution is pH 2.4-3.4, average 2.9 — rounded to 3.0
- Water: pure is 7.0, tap may vary, but for lab, often used as 7.0
- Baking soda: NaHCO3, 0.1M is pH 8.3 — ok
- Washing soda: Na2CO3, 0.1M is pH 11.0 — ok
- Drain cleaner: NaOH, concentrated is pH 14 — ok

Estimated pH based on matching to Part 1 references as per worksheet design.

So, the final answer is the filled table.

──────────────────────────────────────

Final Answer:
Substance | Color Indicator | Estimated pH | Actual pH-researched
---|---|---|---
Lemon Juice | Red | 2 | 2.3
White Vinegar | Pink | 5 | 3.0
Distilled Water | Purple | 7 | 7.0
Baking Soda Solution | Blue | 8 | 8.3
Washing Soda Solution | Green | 11 | 11.0
Drain Cleaner | Yellow | 14 | 14.0