Integers Rules ADDITION When we ADD a POSITIVE number we move UP the number line. e.g. (-3) + 7 = 4 When we ADD a NEGATIVE number we move DOWN the number line. e.g. 2 + (-8) = -6 SUBTRACTION When we SUBTRACT a POSITIVE number we move DOWN the number line.ntegers Rules ADDITION When we ADD a POSITIVE number we move UP the number line. e.g. (-3) + 7 = 4 When we ADD a NEGATIVE number we move DOWN the number line. e.g. 2 + (-8) = -6 SUBTRACTION When we SUBTRACT a POSITIVE number we move DOWN the number line.
Commercially sold distilled white vinegar in the US is acetic acid in water, at a concentration of 5% by mass for a pH of around 2.4â2.6. If you add water to it, the pH will go up. If you distill it (vinegar is more volatile than water) the resulting distillate will have a lower pH.
What makes apple cider vinegar such a bad whitening strategy is that it can actually be effective, partly for the same reason that itâs damaging. Apple cider vinegar is a strong acid, with a pH of about 2.4, about the same as Coke.If you put this strong acid on your teeth, it can remove some of the organic stain molecules that are trapped in your enamelâalong with the enamel.hat makes apple cider vinegar such a bad whitening strategy is that it can actually be effective, partly for the same reason that itâs damaging. Apple cider vinegar is a strong acid, with a pH of about 2.4, about the same as Coke.