and physical properties. Thus we have P = 5 phases.

There are 6 elements present (H, O, Na, K, Cl, Br), but we have 2 constraints:

* The stoichiometry of water: n(H) = 2n(O).
* Charge balance in the solution: n(Na) + n(K) = n(Cl) + n(Br).

giving C = 6 - 2 = 4 components. The Gibbs phase rule states that F = 1. So, for example, if we plot the P-T phase diagram of the system, there is only one line at which all phases coexist. Any deviation from the line would either cause one of the salts to completely dissolve or

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