How is Standard Gibbs free energy measured?

I have seen hole theory of thermodynamics but almost nothing about the experiments that measure $\Delta G^\circ$. I know how to measure it by electrodes, when the reaction is a redox one. But what with other reactions?

What are the experimental ways to determine $\Delta G^\circ$? Some examples would be helpful

• You're probably asking about $\Delta G$, which is actually quite different from $G$. – Zhe Jun 2 '17 at 15:50
• – Mithoron Jun 2 '17 at 21:25

Generally you measure the equilibrium constant $K$ and then convert it to $\Delta G^\circ$ (note that is change in standard free energy)
$\Delta G^\circ = -RT \ln K$