Question
What does the negative sign in the expression $\text{E}^\ominus_{\text{zn}^{2+}/\text{zn}}=-0.76\text{V}$ mean?
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$\text{CH}_3-\text{CH}-\text{CH}_2\text{OH}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$