Complete the following table. (All solutions are at 25 °C.) [H3O+] [OH-] ou- PH no Acidic…
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Question “Complete the following table. (All solutions are at 25 °C.) [H3O+] [OH-] ou- PH no Acidic…”
Answer
The following formula can be used to answer this question:
The value of pKw at room temperature is 14 and 1 bar pressure are respectively, pH and pOH are the following:
These formulae and the values can be used to determine all the unknowns within the table.
For the First row:
The concentration of H3O+ ion is given, 3.5 X
10-3
This value can be used to determine the pH of the first row, pH1.
This allows us to determine the concentration of OH ion.
Now let’s use the relationship between pOH concentration and OH- to arrive at the following equation.
The solution to this problem is acidic., as the H3O+ ions are more concentrated than the OH-ions and the pH is lower than 7.
For the second row:
The concentration of OH- ions is given, 3.8 X
10-7
This value can be used to determine the pOH of the first row.
This allows us to determine the concentration of H3O+ions.
Now let’s use the relationship between pH and H3O+ concentrations to arrive at the following equation.
The solution to this problem is basic., as the H3O+ ions are less than the OH-ions and the pH is higher than 7.
For the third row:
The concentration of H3O+ ion is given, 1.8 X
10-9
This value can be used to determine the pH of the first row, pH1.
This allows us to determine the concentration of OH ion.
This equation is based on the relationship between pOH concentration and OH-.
Since the pH of H3O+ ions has a lower concentration than that of OH-ions, the pH solution is $strongTag5
For the fourth row:
From The pH is given, 7.15,, we can conclude that the solution is basic since the pH is higher than 7.
This allows us to determine the concentration of H3O+ions.
We can determine the value of the OH-ions by using the pH value.
This equation is based on the relationship between pOH concentration and OH-.
Since the pH of H3O+ ions has a lower concentration than that of OH-ions, the pH solution is basic.
The box is now complete.
[H3O+] | [OH-] | pH | Acidic or basic |
3.5 X 10-3. |
2.88 X 10-12 |
2.46 |
Acidic |
2.63 X 10-8 | 3.8 X 10-07. |
7.58 |
Basic |
1.8 X 10-9. |
5.50 X 10-6 |
8.74 |
Basic |
7.08 X10-8 |
1.41 X 10-7 | 7.15 |
Basic |
Conclusion
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