Ma'anar ƙamus na ion hydrogen wani abu ne mai inganci wanda ya ƙunshi atom ɗin hydrogen wanda ya yi hasarar electron ɗinsa, yawanci ana bayyana shi da alamar H . A cikin maganin ruwa mai ruwa, ions hydrogen sau da yawa suna shiga cikin halayen sinadarai kuma suna iya ƙayyade pH na maganin. Matsakaicin ions hydrogen a cikin bayani shine ma'auni na acidity ko asali, tare da ƙananan pH yana nuna mafi girma na ions hydrogen da kuma maganin acidic.