Q:

What does PH stand for in chemistry?

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Quick Answer

The symbol pH stands for the "power of hydrogen." The pH of a solution measures how many hydrogen ions are present in a solution. The numbers on the pH scale tell whether a solution is acidic or basic.

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Full Answer

Values for pH usually run from 0 to 14, with lower numbers representing extremely acidic substances and higher numbers delineating substances that are strong bases. Pure water has a neutral pH, which is 7. Concentrated hydrochloric acid is extremely acidic and registers at a pH of 0. A concentrated strong base, such as sodium hydroxide, or lye, has a pH of 14. The pH of substances is measured by using a pH meter or with red and blue litmus paper.

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Related Questions

  • Q:

    What is the pH of water?

    A:

    The pH of pure water at 25 degrees Celsius is very close to 7. This pH value indicates that water is neutral, meaning that it is neither acidic nor basic. Acids have pH values lower than 7, and bases have pH values higher than 7.

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  • Q:

    What is the pH of rubbing alcohol?

    A:

    According to the University of California Santa Barbara, the pH of rubbing alcohol is about 5.5. This level can vary based on the dilution factor or the brand of the rubbing alcohol.

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  • Q:

    What is the pH of ammonia?

    A:

    The pH of ammonia is about 11, which makes it a fairly weak base. According to the pH scale, substances with a pH lower than 7 are acids, whereas those with a pH greater than 7 are bases.

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  • Q:

    What is the pH of milk?

    A:

    Fresh milk has a pH value that is typically between 6.5 and 6.7, making it slightly acidic. A pH greater than 6.7 indicates that the udders producing the milk are inflamed by pathogens, and milk with a pH lower than 6.5 indicates heavy bacterial action and milk spoilage.

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