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 NaOH?

    A:

    The pH of NaOH is 14. NaOH, or sodium hydroxide, is a highly caustic substance and is an alkali, or base. Sodium hydroxide is a white solid at room temperature.

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  • Q:

    What does pH measure?

    A:

    The pH of a solution measures the amount of hydrogen ions that are in a solution. The term "pH" literally means "the power of hydrogen." The pH of a substance tells how acidic or basic a substance is.

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  • Q:

    What is a pH level?

    A:

    The pH level of a substance describes how acidic or basic it is. Substances with a higher pH level are more basic, while substances with a lower pH level are more acidic. A substance with a pH of 7 is considered neutral, neither acidic nor basic.

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