Business student Mary Konye, 22, attacked Naomi Oni over a "trivial, insignificant" argument after following her home from work.
Ms Oni was left scarred for life after suffering serious burns on her face and chest following the incident in Dagenham, east London, on December 30 2012.
Judge David Radford, who sentenced Konye to 12 years at London's Snaresbrook Crown Court, said the consequences had been "devastating" to Ms Oni. He added that it was a "premeditated and callous" plan to disfigure the victim.
Konye, who was convicted in January, looked straight ahead and showed no reaction as she was sentenced.
Ms Oni, 22, who did not attend the sentencing, said in a statement to the court that she considered killing herself after being "violated" by her attacker.
Judge Radford said: "This careful, premeditated criminality was planned against a person who reasonably believed you were a true friend."