Use the formula pH = −log[H^+]
9.. The hydrogen ion concentration of a substance is 4.3*10^-6 × moles per liter.Find the pH.
Round to the nearest tenth.
10. Find the hydrogen ion concentration of a solution whose pH is 5.3.
-log 4.3*10^-6 = -log 4.3 + -log 10^-6
= 6 -.633 = 5.37 = 5.4
-5.4 = log H+
10^-5.4 = H+ = 10^-5 * 10^-.4
= .398 * 10^-5
= 3.98 * 10^-6
9. To find the pH of a substance with a given hydrogen ion concentration, we can use the formula pH = -log[H+]. Given that the hydrogen ion concentration is 4.3 * 10^-6 moles per liter, we substitute the value into the formula:
pH = -log(4.3 * 10^-6)
Calculating this using a calculator gives us:
pH ≈ 5.37
Rounding to the nearest tenth, the pH is approximately 5.4.
10. To find the hydrogen ion concentration of a solution with a given pH, we can rearrange the formula pH = -log[H+] to solve for [H+]. The formula becomes:
[H+] = 10^(-pH)
Given that the pH is 5.3, we substitute the value into the formula:
[H+] = 10^(-5.3)
Calculating this using a calculator gives us:
[H+] ≈ 5.01 * 10^(-6) moles per liter
Therefore, the hydrogen ion concentration of the solution with a pH of 5.3 is approximately 5.01 * 10^(-6) moles per liter.
To find the pH using the formula pH = -log[H+], we need to know the hydrogen ion concentration [H+].
For question 9:
The given hydrogen ion concentration is 4.3 * 10^-6 moles per liter.
To find the pH, we can substitute this value into the formula:
pH = -log(4.3 * 10^-6)
Using a scientific calculator or a calculator with a logarithm function, evaluate the expression:
pH ≈ -log(4.3 * 10^-6) ≈ -(-5.366) ≈ 5.366
Rounding to the nearest tenth, the pH is approximately 5.4.
For question 10:
The given pH is 5.3.
To find the hydrogen ion concentration [H+], we can rearrange the formula as follows:
-H+ = 10^(-pH)
Substituting the given value, we get:
[H+] = 10^(-5.3)
Using a calculator to evaluate this expression, we find that the hydrogen ion concentration is approximately 5.01 * 10^(-6) moles per liter.