An acidic buffer solution is actually just one which contains a pH under 7. Acidic buffer solutions are commonly made from a weak acid and one of its salts - generally a sodium salt. Acid detergents also are useful for the avoidance or removing of water scale (calcium and magnesium https://whatcleanersarealkaline57811.suomiblog.com/alkaline-water-for-cleaning-for-dummies-44718430