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We need to find the effect of$H^{+}$.

Here,

Determine the effect of $H^{+}$accumulation in the intermembrane space.

The chemiosmotic model links the energy from electron transport to a $a{H}^{+}$gradient that leads to ATP synthesis. In this model, each complex $\left(l,lll,andlV\right)$functions as a proton pump by pushing $H^{+}ions$, which is formed from the oxidation of $NADHandFAD{H}_2$, from the matrix to the intermembrane space. As more role="math" localid="1653125699186" $H^{+}ions$accumulate in the intermembrane space, the $pH$lowers and $a{H}^{+}$the gradient is formed. They role="math" localid="1653125773641" $H^{+}ions$are positively charged, Therefore a lower $pH$and electrical charge of the $H^{+}$gradient makes it an electrochemical gradient.

The role="math" localid="1653125890515" $H^{+}ions$need to return to the matrix to equalize $pH$and the electrical charge. They can return to the matrix by passing through the ATP synthase.