Question

plug in the avg.

Filter Media
Dirty Water pH
pH after Filtration [Trial 1]
pH after Filtration [Trial 2]
pH after Filtration [Trial 3]
pH after Filtration [Trial 4]
pH after Filtration [Trial 5]
Avg.
Cotton Balls
6.2
6.4
6.5
6.4
6.5
6.6


Coffee Filter
6.2
6.5
6.6
6.4
6.6
6.6


Charcoal
6.2
6.4
6.5
6.4
6.5
6.5


Sand
6.2
7.0
7.1
7.1
7.0
7.2


Marble
6.2
6.7
6.7
6.8
6.7
6.8

Answer 1

To calculate the average pH values after filtration for each media, we'll sum the pH values from all trials and then divide by the number of trials (which is 5).

**Calculations:**

1. **Cotton Balls**
- pH values: 6.4, 6.5, 6.4, 6.5, 6.6
- Sum: 6.4 + 6.5 + 6.4 + 6.5 + 6.6 = 32.4
- Average: 32.4 / 5 = 6.48

2. **Coffee Filter**
- pH values: 6.5, 6.6, 6.4, 6.6, 6.6
- Sum: 6.5 + 6.6 + 6.4 + 6.6 + 6.6 = 32.7
- Average: 32.7 / 5 = 6.54

3. **Charcoal**
- pH values: 6.4, 6.5, 6.4, 6.5, 6.5
- Sum: 6.4 + 6.5 + 6.4 + 6.5 + 6.5 = 32.3
- Average: 32.3 / 5 = 6.46

4. **Sand**
- pH values: 7.0, 7.1, 7.1, 7.0, 7.2
- Sum: 7.0 + 7.1 + 7.1 + 7.0 + 7.2 = 35.4
- Average: 35.4 / 5 = 7.08

5. **Marble**
- pH values: 6.7, 6.7, 6.8, 6.7, 6.8
- Sum: 6.7 + 6.7 + 6.8 + 6.7 + 6.8 = 33.7
- Average: 33.7 / 5 = 6.74

**Final Results with Averages:**

| Filter Media | Dirty Water pH | pH after Filtration [Trial 1] | pH after Filtration [Trial 2] | pH after Filtration [Trial 3] | pH after Filtration [Trial 4] | pH after Filtration [Trial 5] | Avg. |
|----------------|----------------|-------------------------------|-------------------------------|-------------------------------|-------------------------------|-------------------------------|-------|
| Cotton Balls | 6.2 | 6.4 | 6.5 | 6.4 | 6.5 | 6.6 | 6.48 |
| Coffee Filter | 6.2 | 6.5 | 6.6 | 6.4 | 6.6 | 6.6 | 6.54 |
| Charcoal | 6.2 | 6.4 | 6.5 | 6.4 | 6.5 | 6.5 | 6.46 |
| Sand | 6.2 | 7.0 | 7.1 | 7.1 | 7.0 | 7.2 | 7.08 |
| Marble | 6.2 | 6.7 | 6.7 | 6.8 | 6.7 | 6.8 | 6.74 |

Let me know if you need any more assistance!