There is a hole in the left side wall that Samus can fit into by shrinking her hitbox. Once in the wall, stand up if crouched then turnaround into a buffered spinjump to jump out of the acid.

Requires:

{"tech": "canPartialFloorClip"},
"canSuitlessLavaDive",
{"or": [
  {"and": [
    "canLateralMidAirMorph",
    "canDownBack",
    "canTrickyJump",
    {"acidFrames": 110},
    {"heatFrames": 285}
  ]},
  {"and": [
    "canDash",
    "canTrickyJump",
    {"acidFrames": 140},
    {"heatFrames": 300}
  ]},
  {"and": [
    {"acidFrames": 230},
    {"heatFrames": 390}
  ]}
]}