Improper Words of Consecration
On Sunday the priest confused the words of the consecration. Was it a valid Eucharist?
It depends on what you mean when you say he "confused the words of consecration." The approved [Roman Rite] and essential words of consecration that must be said over the host for validity is: "This is my body" and over the wine "This is my blood" or "This is the cup of my blood." If a priest omits any of these essential words of consecration, the consecration is invalid.
From Office for the Liturgical Celebrations of the Supreme Pontiff:
The Priest and the Canon of the Mass
[As] the theologian Joseph Ratzinger put it so well: "In order that an event that occurred in the past is made present, the words must therefore be pronounced: This is my body—this is my blood. But in these words it is assumed that the I of Jesus Christ speaks. Only he can say these things; they are his words. No man can pretend to declare the I of Jesus Christ as his own. No one can say here are many communities can transmit, rather it can only be founded on the 'sacramental' authorization given to the whole Church by Jesus Christ himself. . . . And this is exactly the 'priestly ordination' and the 'priesthood'" (20).