Round all answers to 2 decimal places.
Enter concentrations in scientific notation like the following example
5.39x10^-5 M (no spaces in the number, space before the M)

1. The hydrogen ion concentration ([H+]) of a solution is 8.9 × 10^-7 mol/L. What is its pH?
2. The pH of a solution is 12.35. What is its hydrogen ion concentration ([H+]) in mol/L?

Please explain how you found your answers with step-by-step explaination