pH is a scale used to measure the acidity or alkalinity of a solution. This scale ranges from -1 (most acidic) to 14 (most basic). A pH level of 7 is neutral. For example, freshly distilled water would be a neutral 7. Fresh lemon juice would be more acidic at around 2. Baking soda would be basic at around 9.
It is impossible for any given solution to have a pH of 74. I would expect fresh uncontaminated rainwater to be closer to neutral at around 7.
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