30. Calculate the [H*] in a solution that has a pH of 7.0. a. 3.9 M b. 10.1 M c. 1.2 x 104 M d. 1.0 x 10-7M 2482000-2004) all skols 15--100=10 =419-215

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### Example Question on pH and Hydrogen Ion Concentration:

**30. Calculate the \([ \text{H}^+ ]\) in a solution that has a pH of 7.0.**

**Given Choices:**
a. \( 3.9 \, M \)

b. \( 10.1 \, M \)

c. \( 1.2 \times 10^{-4} \, M \)

d. \( 1.0 \times 10^{-7} \, M \)

#### Explanation:

To find the hydrogen ion concentration \([ \text{H}^+ ]\), we can use the relationship between pH and \([ \text{H}^+ ]\):

\[ \text{pH} = -\log [ \text{H}^+ ] \]

For a solution with a pH of 7.0,

\[ 7.0 = -\log [ \text{H}^+ ] \]

Rewriting this equation to solve for \([ \text{H}^+ ]\):

\[ [ \text{H}^+ ] = 10^{-7} \, M \]

Since the pH is neutral (pH = 7.0), the hydrogen ion concentration is:

\[ [ \text{H}^+ ] = 1.0 \times 10^{-7} \, M \]

Thus, the correct answer is:
d. \( 1.0 \times 10^{-7} \, M \)
Transcribed Image Text:### Example Question on pH and Hydrogen Ion Concentration: **30. Calculate the \([ \text{H}^+ ]\) in a solution that has a pH of 7.0.** **Given Choices:** a. \( 3.9 \, M \) b. \( 10.1 \, M \) c. \( 1.2 \times 10^{-4} \, M \) d. \( 1.0 \times 10^{-7} \, M \) #### Explanation: To find the hydrogen ion concentration \([ \text{H}^+ ]\), we can use the relationship between pH and \([ \text{H}^+ ]\): \[ \text{pH} = -\log [ \text{H}^+ ] \] For a solution with a pH of 7.0, \[ 7.0 = -\log [ \text{H}^+ ] \] Rewriting this equation to solve for \([ \text{H}^+ ]\): \[ [ \text{H}^+ ] = 10^{-7} \, M \] Since the pH is neutral (pH = 7.0), the hydrogen ion concentration is: \[ [ \text{H}^+ ] = 1.0 \times 10^{-7} \, M \] Thus, the correct answer is: d. \( 1.0 \times 10^{-7} \, M \)
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