Rank These Solutions From The Most Alkaline (1) To The Least Alkaline (5).1. $pOH = 0.5$2. $pH = 3.5$3. $\left[ \text{OH}^{-} \right] = 5.62 \times 10^{-5} , M$4. $\left[ \text{H}_3\text{O}^{+} \right] = 3.16 \times

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Ranking Alkaline Solutions: Understanding pH and pOH Values

In chemistry, the pH and pOH scales are used to measure the acidity or alkalinity of a solution. The pH scale ranges from 0 to 14, with a pH of 7 being neutral, below 7 being acidic, and above 7 being alkaline. The pOH scale is related to the pH scale and is used to measure the concentration of hydroxide ions (OH-) in a solution. In this article, we will rank five different solutions based on their alkalinity, from the most alkaline to the least alkaline.

Before we dive into ranking the solutions, let's briefly review the concepts of pH and pOH. The pH of a solution is defined as the negative logarithm of the concentration of hydrogen ions (H+) in the solution. Mathematically, it can be expressed as:

pH = -log[H+]

The pOH of a solution is defined as the negative logarithm of the concentration of hydroxide ions (OH-) in the solution. Mathematically, it can be expressed as:

pOH = -log[OH-]

Now that we have a basic understanding of pH and pOH, let's rank the five solutions based on their alkalinity.

1. pOH=0.5pOH = 0.5

A pOH value of 0.5 indicates that the solution is highly alkaline. To understand why, let's convert the pOH value to a concentration of hydroxide ions. We can do this by taking the antilogarithm of the pOH value:

[OH-] = 10^(-pOH) = 10^(-0.5) = 3.1623 M

This is a very high concentration of hydroxide ions, indicating that the solution is highly alkaline.

2. pH=3.5pH = 3.5

A pH value of 3.5 indicates that the solution is acidic. To understand why, let's convert the pH value to a concentration of hydrogen ions. We can do this by taking the antilogarithm of the pH value:

[H+] = 10^(-pH) = 10^(-3.5) = 3.1623 x 10^(-4) M

This is a very low concentration of hydrogen ions, indicating that the solution is acidic.

3. [OH−]=5.62×10−5 M\left[ \text{OH}^{-} \right] = 5.62 \times 10^{-5} \, M

A concentration of hydroxide ions of 5.62 x 10^(-5) M is relatively low. To understand why, let's convert this concentration to a pOH value:

pOH = -log[OH-] = -log(5.62 x 10^(-5)) = 4.25

This is a relatively low pOH value, indicating that the solution is slightly alkaline.

4. [H3O+]=3.16×10−4 M\left[ \text{H}_3\text{O}^{+} \right] = 3.16 \times 10^{-4} \, M

A concentration of hydrogen ions of 3.16 x 10^(-4) M is relatively low. To understand why, let's convert this concentration to a pH value:

pH = -log[H+] = -log(3.16 x 10^(-4)) = 3.5

This is a relatively low pH value, indicating that the solution is slightly acidic.

5. [H3O+]=1.0×10−7 M\left[ \text{H}_3\text{O}^{+} \right] = 1.0 \times 10^{-7} \, M

A concentration of hydrogen ions of 1.0 x 10^(-7) M is very low. To understand why, let's convert this concentration to a pH value:

pH = -log[H+] = -log(1.0 x 10^(-7)) = 7.0

This is a relatively high pH value, indicating that the solution is neutral.

In conclusion, the five solutions can be ranked from the most alkaline to the least alkaline as follows:

  1. pOH=0.5pOH = 0.5
  2. [H3O+]=1.0×10−7 M\left[ \text{H}_3\text{O}^{+} \right] = 1.0 \times 10^{-7} \, M
  3. [OH−]=5.62×10−5 M\left[ \text{OH}^{-} \right] = 5.62 \times 10^{-5} \, M
  4. [H3O+]=3.16×10−4 M\left[ \text{H}_3\text{O}^{+} \right] = 3.16 \times 10^{-4} \, M
  5. pH=3.5pH = 3.5

This ranking is based on the concentration of hydroxide ions and hydrogen ions in each solution, which are used to calculate the pOH and pH values, respectively.
Frequently Asked Questions: Understanding pH and pOH Values

In our previous article, we discussed the concepts of pH and pOH values and ranked five different solutions based on their alkalinity. In this article, we will answer some frequently asked questions related to pH and pOH values.

Q: What is the difference between pH and pOH?

A: pH and pOH are two related but distinct measures of the acidity or alkalinity of a solution. pH measures the concentration of hydrogen ions (H+) in a solution, while pOH measures the concentration of hydroxide ions (OH-) in a solution.

Q: How are pH and pOH related?

A: pH and pOH are related by the following equation:

pH + pOH = 14

This equation shows that the sum of the pH and pOH values of a solution is always 14.

Q: What is the pH scale?

A: The pH scale is a scale that ranges from 0 to 14, with a pH of 7 being neutral, below 7 being acidic, and above 7 being alkaline.

Q: What is the pOH scale?

A: The pOH scale is a scale that ranges from 0 to 14, with a pOH of 7 being neutral, below 7 being acidic, and above 7 being alkaline.

Q: How do I calculate the pH of a solution?

A: To calculate the pH of a solution, you need to know the concentration of hydrogen ions (H+) in the solution. You can use the following equation:

pH = -log[H+]

Q: How do I calculate the pOH of a solution?

A: To calculate the pOH of a solution, you need to know the concentration of hydroxide ions (OH-) in the solution. You can use the following equation:

pOH = -log[OH-]

Q: What is the pH of a solution with a pOH of 3?

A: To find the pH of a solution with a pOH of 3, you can use the following equation:

pH + pOH = 14

Rearranging this equation to solve for pH, you get:

pH = 14 - pOH = 14 - 3 = 11

Q: What is the pOH of a solution with a pH of 9?

A: To find the pOH of a solution with a pH of 9, you can use the following equation:

pH + pOH = 14

Rearranging this equation to solve for pOH, you get:

pOH = 14 - pH = 14 - 9 = 5

Q: How do I determine the alkalinity of a solution?

A: To determine the alkalinity of a solution, you need to know the concentration of hydroxide ions (OH-) in the solution. You can use the following equation:

pOH = -log[OH-]

If the pOH value is below 7, the solution is alkaline. If the pOH value is above 7, the solution is acidic.

In conclusion, pH and pOH values are important measures of the acidity or alkalinity of a solution. By understanding the relationship between pH and pOH, you can calculate the pH and pOH values of a solution and determine its alkalinity. We hope this article has helped you to better understand pH and pOH values.