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[No.] 18 [ANSWERS] pH is a measure of the acidity of a solution. A pH scale is used to measure the acidity or alkalinity of a liquid. This scale ranges from zero to 14. The lower the pH value, the more acidic a substance is and the higher the pH the more alkaline a material. Milk, for example, has a pH of seven which is considered neutral on the pH scale. Beer and juice are more acidic than milk as both have a pH of four. Click ► for CHART [QUESTION] 
What is pH? Click ► for CHART
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