Vinegar, which contains acetic acid, can lower the pH levels of water ... pH deviates too far from the required safe zone on the scale. Chlorine works best at 7.4, so if it drops too low, it ...

Red wine vinegar has a pH of 3, making it one of the most acidic food products on the scale (a quick pH primer: the scale ranges from 0 -- battery acid, to 14, which is the most "basic" or non ...

The pH scale measures how strongly acidic or alkaline ... Red cabbage A kettle and water Household substances to test, such as lemonade, vinegar, baking powder or toothpaste.