Question
Part 1 of 2 Suppose the pH of a solution decreases by 8 . How does the hydrogen ion concentration change? The new hydrogen ion concentration is \( \square \) times the initial concentration. 0 of 1 (Use scientific notation. Use the multiplication symbol in the math palette as needed.)
Ask by Page Mccarthy. in the United States
Mar 12,2025
Upstudy AI Solution
Tutor-Verified Answer
Answer
The new hydrogen ion concentration is \( 10^{8} \) times the initial concentration.
Solution
Let the initial pH be \( p \), so the initial hydrogen ion concentration is
\[
[H^+]_{\text{initial}} = 10^{-p}.
\]
When the pH decreases by 8, the new pH is
\[
p_{\text{new}} = p - 8.
\]
The new hydrogen ion concentration is then
\[
[H^+]_{\text{new}} = 10^{-(p-8)} = 10^{8} \times 10^{-p}.
\]
To find how many times greater the new concentration is compared to the initial concentration, compute the ratio:
\[
\frac{[H^+]_{\text{new}}}{[H^+]_{\text{initial}}} = \frac{10^{8} \times 10^{-p}}{10^{-p}} = 10^{8}.
\]
Thus, the new hydrogen ion concentration is \( 10^{8} \) times the initial concentration.
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Extra Insights
When the pH of a solution decreases by 8, it indicates that the solution has become more acidic. The pH scale is logarithmic, meaning each unit change represents a tenfold change in hydrogen ion concentration. Therefore, a decrease of 8 in pH signifies that the hydrogen ion concentration increases by a factor of \( 10^8 \). So, the new hydrogen ion concentration is \( 1.0 \times 10^8 \) times the initial concentration.