Questions and Answers
The average pH range of hair, skin, and nails is 4.5 to 5.5.
True
Alkalis tend to taste:
In chemistry, pH stands for:
potential hydrogen
What is a negatively charged ion called?
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A pH of 5 is how many times more acidic than a pH of 6?
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When a solution has an equal number of hydrogen and hydroxide ions, the solution is considered:
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What happens when an alkali is placed in water?
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In what pH range is hair, skin, and nails?
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A solution that has more negative hydroxide ions than positive hydrogen ions is:
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On the pH scale, numbers less than 7 indicate a(n):
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Acids tend to taste:
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On the pH scale, the closer you get to 14, the stronger the acidity.
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What ingredient is listed as the primary ingredient on many skin care products?
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Why is pure water considered a neutral substance?
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What kind of substances does pH indicate the acidity or alkalinity of?
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What color does blue litmus paper turn when placed in an acid?
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Distilled water with a pH of 7 is considered?
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Water molecules have two hydrogen atoms and one:
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What color does red litmus paper turn when placed in an alkali?
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On the pH scale, numbers greater than 7 indicate a(n):
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All of the following statements regarding the pH scale are true EXCEPT: values below 7 indicate more alkalinity.
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Solutions that are acidic or alkaline in value can be dissolved in and/or contain:
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Study Notes
pH Basics
- Average pH range of hair, skin, and nails is between 4.5 and 5.5, indicating slightly acidic nature.
- pH stands for "potential hydrogen" in chemistry, which measures acidity or alkalinity.
- pH scale indicates a solution's acidity: numbers less than 7 signify an acidic solution, while numbers greater than 7 indicate an alkaline solution.
Acidity and Alkalinity
- Acids have a sour taste, while alkalis taste bitter.
- Solutions that have an equal number of hydrogen ions (H⁺) and hydroxide ions (OH⁻) are considered neutral.
- A solution with more negative hydroxide ions than positive hydrogen ions is alkaline.
- An alkali in water decreases the concentration of hydrogen ions.
Ion Types
- A negatively charged ion is called an anion.
- Distilled water, with a pH of 7, is categorized as neutral due to balanced positive and negative ions.
Litmus Test
- Blue litmus paper turns red in acidic conditions, while red litmus paper turns blue in alkaline conditions.
Concentration and Solutions
- A pH of 5 is ten times more acidic than a pH of 6, indicating a logarithmic scale in pH measurement.
- Solutions that are either acidic or alkaline typically are water-based.
Common Ingredients
- Water is commonly listed as the primary ingredient in many skincare products, signifying its role in pH balancing.
Misconceptions
- It is incorrect to say that values below 7 indicate more alkalinity; they actually indicate increasing acidity.
- The assertion that the closer one gets to 14 the stronger the acidity is false; higher numbers indicate increased alkalinity.
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Description
Test your knowledge about pH levels and their significance in chemistry with these flashcards. From the acidity of hair and skin to definitions of ions, these cards cover essential concepts related to pH. Perfect for students wanting to strengthen their understanding of chemical properties!
