Yes, a pH of 2 - 3.8 can help to kill bacteria. Most bacteria grow best at a pH between 6.5 and 7.5, and they can be inhibited or killed by acidic conditions. A pH of 2 - 3.8 is considered to be acidic, and it can cause the proteins and enzymes in bacteria to become denatured, which can lead to cell death. In addition, acidic conditions can also damage the cell wall of bacteria, making them more susceptible to attack by other antimicrobial agents.