7. Recall: pH = log [H+] where [H+] is the concentration of hydrogen ions in moles per liter in the solution.
a. Find the pH level of a substance with a hydrogen ion concentration of
0.000 0042 moles per liter. Your answers should be to the nearest tenth.
The pH level of this substance is __________.
b. The pH level of an apple is about 3.3. The hydrogen ion concentration for an
apple is _____________________ moles per liter. Your answer should be to the nearest ten-thousandth (4 decimal places).

Question

7. Recall: pH = log [H+] where [H+] is the concentration of hydrogen ions in moles per liter in the solution.
a. Find the pH level of a substance with a hydrogen ion concentration of
0.000 0042 moles per liter. Your answers should be to the nearest tenth.
The pH level of this substance is __________.
b. The pH level of an apple is about 3.3. The hydrogen ion concentration for an
apple is _____________________ moles per liter. Your answer should be to the nearest ten-thousandth (4 decimal places).

sirm3d · Answer

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

anonymous · Answer

now what i'm wondering, do i plug in the amount of moles for the H+ or is there another formula to find the Ph that i need to know?