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.
Solutions with pH levels below seven are considered acidic. Those with pH levels at seven are considered neutral. Litmus paper is paper that has been treated with a mixture of natural dyes known as lichens, or Roccella tinctoria. Litmus paper is not the only method of using color change to detect pH level. One natural way to do so is to use red cabbage juice. It appears red in acidic solutions, blue in neutral ones and greenish-yellow is base solution with pH levels at 12.