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Acid and Base pH Calculations Supplemental Worksheet KEY

are the concentrations of H3O+ ions, OH-ions, weak acids and weak bases. So here we have [H3O+] = n/V = 0.01 moles / 0.3 L = 0.033 M. Note we had to convert back to concentrations from moles. The volume of the solution is 0.3 L because 200 mL was added to 100 mL. Step 3: What is the pH of the solution?