K(+)(in) + chloride(in) = K(+)(out) + chloride(out)
k(+)(in) + chloride(in) = k(+)(out) + chloride(out)
K(+)(in) + chloride(in) = K(+)(out) + chloride(out)
k(+)(in) + chloride(in) = k(+)(out) + chloride(out)