What is the [H+] of a solution with a pH of 5.0? Use a scientific calculator as needed. 7.7\cdot10^{-5} 2.5\cdot10^{-6} 1.0\cdot10^{-5}
Question
What is the [H+] of a solution with a pH of 5.0?
Use a scientific calculator as needed.
- 7.7\cdot10^{-5}
- 2.5\cdot10^{-6}
- 1.0\cdot10^{-5}
Solution
The pH of a solution is a measure of the hydrogen ion concentration, [H+]. The pH is calculated as the negative logarithm (base 10) of the [H+] in moles per liter.
So, if we have a solution with a pH of 5.0, we can calculate the [H+] as follows:
- Write down the pH value: pH = 5.0
- Use the definition of pH, which is pH = -log[H+]. We need to solve this equation for [H+], which gives us [H+] = 10^-pH.
- Substitute the given pH value into the equation: [H+] = 10^-5.0
- Using a scientific calculator, calculate the value of 10^-5.0.
The result is [H+] = 1.0 x 10^-5 M. So, the [H+] of a solution with a pH of 5.0 is 1.0 x 10^-5 M.
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