This article in ThoughtCo.com claims we have a resting stomach pH of 4-5.
Unfortunately, there are no references, so I can't verify what it says.
I am slightly confused, however. The study says "Results are given as medians and interquartile ranges: fasted gastric pH, 1.3 (1.1-1.6); gastric pH during the meal, 4.9 (3.9-5.5)"
This other one says "In the fasted state, the median gastric pH was 1.7"
This article in UCSB Scienceline says "The normal human stomach has a pH which can range from approximately 1-3 but is usually closer to 2.". Unfortunately, they too don't provide any references, so I can't check their claim.
So what is the pH of a human stomach at rest? If it is about 2, then did the article in ThoughtCo.com get it wrong? If it is about 4-5, then what did I misunderstand in the two studies I cited?