This is probably the matchup I've played the most in MK2.
I always start out playing people by picking Kitana, and I'd say 70% of people I play choose Scorpion as a counter that first match.
KITANA
She has the advantage here, but it's still a fairly close match.
She wants to be aggressive but Scorpion can play keep-away pretty well.
Best scenario for Kitana is trapping him in a corner, where he can't teleport out. And if she catches him in a fan raise, he can say bye-bye to 75% of his life. Because he can almost always teleport away from her, it can be tiring to constantly try chasing Scorpion down. So when that happens, let Scorpion come to you and instant fan raise him. Block all telepunches and instantly fan raise. I've never had a problem doing crossovers with Kitana vs any Scorpions
MKillBill
SCORPION
He needs to stay away to win, unless you can pressure her with crossovers and air throws. Bait her and aaHK all her jump-ins. AVOID putting yourself in a corner, or you're in big trouble. Walk-forward instant spears work well against everyone except elites who will be expecting it. Instant spears from crouch also work well, but are less surprising than walk-forward ones. The threat of his spear and/or telepunch forces Kitana to play a little more defensive than vs most other characters. Only spear from afar however- if she blocks a spear up close, she can fan raise you, or at very least sweep.
On paper this seems like an 8-2 match for Kitana. But in reality, an elite Scorpion is incredibly tricky and evasive.
6-4 for Kitana.