Part $2$: You just discovered that the outer membrane of the mitochondria is permeable to small molecules so even ions can pass through. The pH of the intermembrane space of the mitochondria is $7\mathrm{.}4$ which is the same as the pH of the cytoplasmic fluid $($cytosol$).$ You are excited and ready to announce that this is conclusive evidence that the chemiosmotic theory is wrong!!!!!$$ Then you measure that the pH of the matrix is close to $8.$ The electrochemical gradient is much less in the mitochondria compared to the chloroplast but there is still a higher concentration of protons in the intermembrane space compared to the matrix$$ because $[$ Select $]["$more protons are pumped out of the matrix, than return via chemiosmosis.", "protons are pumped out of the intermembrane space to the matrix", "hydroxyl ions $($OH$-)$ are moved into the matrix", "protons are pumped out of the intermembrane space to the cytosol", "the inner membrane of the mitochondria is also permeable to simple diffussion of ions."$]$