<prompt> pH of the vagina during reproductive age is -2.5-3.75-Apr7-Jun7.2-8.6  <response>: Ans. is b i.e., 4-5 PeriodpHBirth-2 weeks4-52 weeks-prepuberty PubertyShifts from alkaline to acidReproductive period4-5PostmenopauseNeutral or alkaline 6 to 7 