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Europa likely contains an iron-rich metal core. For it to have formed, temperatures within Europa reached 1250 K. At that temperature, accreted chondritic minerals—e.g., carbonates and phyllosilicates—would partially devolatilize. Here, we compute the amounts and compositions of exsolved volatiles. We find that volatiles released from the interior would have carried solutes, redox-sensitive species, and could have generated a carbonic ocean in excess of Europa's present-day hydrosphere, and potentially an early atmosphere. No late delivery of cometary water was necessary. Contrasting with prior work, could be the most abundant solute in the ocean, followed by , , and . However, gypsum precipitation going from the seafloor to the ice shell decreases the dissolved S/Cl ratio, such that ClS at the shallowest depths, consistent with recently inferred endogenous chlorides at Europa's surface. Gypsum would form a 3–10 km thick sedimentary layer at the seafloor.