Barcelona will likely win this season La Liga, Real Madrid is not even in the second position but in the fourth with Barcelona away with 5 points, that is not that far though.
It should not be hard for Real Madrid to win Valencia, it is a home match for Real Madrid and Real Madrid has not lost at home in this season, while Valencia won only ones out of the eighth away matches. Real Madrid is even far better in their h2h.
Real Madrid are currently in second place, just behind Barcelona, only they are now 8 points behind (after Barcelona's victory over Real Betis yesterday), but Real have one game less so they can close that lead back to 5 points again today. So far, it’s not worth talking about Barcelona’s victory in La Liga, the 19th round is just the championship equator, so everything can still change more than once. Real Madrid should beat Valencia, they are not that strong this season.