The short answer is yes, soy sauce is acidic due to the presence of amino acids and organic acids.
The longer answer is that soy sauce, specifically brewed soy sauce, is acidic because it contains an alphabet soup of various essential nutrients. These include vitamins, minerals, and amino acids that contribute to the acidic nature of soy sauce. The primary acid present in soy sauce is acetic acid, which gives it its characteristic tangy flavor. However, it also contains other acids such as lactic acid, which contributes to the complexity of the flavor profile of soy sauce, making it a versatile and popular condiment in many dishes.