Calculate the concentration of OH- in a solution that contains 3.9 × 10-4 mol L-1 H3O+...
Calculate the concentration of OH- in a solution that contains 3.9 × 10-4 mol L-1 H3O+ at 25 °C. Also identify the solution as acidic, basic, or neutral.
Group of answer choices
2.7 × 10-2 mol L-1, acidic
2.7 × 10-2 mol L-1, basic
2.6 × 10-11 mol L-1, basic
2.6 × 10-11 mol L-1, acidic
3.9 × 10-4 mol L-1, neutral
Homework Answers
Answer is 2.6x10-11mol L-1 , and the solution is acidic.
Explanation; Given the concentration of H3O+. By using that value, we can determine the PH.
PH= -log[H3O+]
= -log [3.9x10-4]= 3.4
ie; POH= 14-PH
POH of OH- = 14 - 3.4 = 10.6
concentration of OH- is, [OH-]= 10-POH
= 10-10.6 = 2.6x10-11 mol L-1
The concentrtion of OH- is lesser than H3O+ , so the solution is acidic
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