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Silver nanoparticles (AgNPs) have been synthesized using 1,2-propanediol as a reducing agent, and polyvinyl alcohol as a capping agent. In this present work, the effect of pH on the reduction rate and final product of AgNPs have been investigated. The particles were collected and characterized using an ultraviolet-visible spectrometer and a transmission electron microscope. The results show that the pH affects the reduction rate and morphology of the particles. The reduction rate of Ag atoms increases as the pH incrases which leads to the formation of bigger particles with irregular shape. Meanwhile, when the pH was decreased, the reduction rate of Ag atoms was found to decrease, resulting in the formation of smaller particles with more regular shape. The difference in reduction rate is ascribed due to the descrepancy of the equilibrium reaction for formation of Ag atoms.