The Londoners will be at home again in the quarter-finals, having been drawn against Liverpool's local rivals Everton.
Arsenal were in control when they led 2-0 shortly after halftime, Alex Oxlade-Chamberlain scoring the first goal after 16 minutes and then setting up the second for Lukas Podolski.
Podolski then conceded a penalty for a trip on Luis Suarez and it was converted by Liverpool captain Steven Gerrard in the 60th minute.
Liverpool felt they should have had another penalty for an Oxlade-Chamberlain challenge on Uruguayan Suarez soon after but World Cup referee Howard Webb turned down their strong appeals.
(Writing by Steve Tongue; editing by Tony Jimenez) nL6N0LL0SM
