Questions and Answers
What happens when an alkali is placed in water?
Alkali decreases the concentration of hydrogen ions.
In chemistry, pH stands for:
Potential hydrogen
What color does red litmus paper turn when placed in an alkali?
Blue
All of the following statements regarding the pH scale are true EXCEPT:
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Water molecules have two hydrogen atoms and one:
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In what pH range is hair, skin, and nails?
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Alkalis tend to taste:
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Acids tend to taste:
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Solutions that are acidic or alkaline in value can be dissolved in and/or contain:
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The average pH range of hair, skin and nails is 4.5 to 5.5.
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What kind of substance does pH indicate the acidity or alkalinity of?
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On the pH scale, numbers less than 7 indicate a(n):
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What ingredient is listed as the primary ingredient on many skin care products?
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A solution that has more negative hydroxide ions than positive hydrogen ions is:
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What color does blue litmus paper turn when placed in an acid?
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On the pH scale, the closer you get to 14, the stronger the acidity.
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When a solution has an equal number of hydrogen and hydroxide ions, the solution is considered:
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Distilled water with a pH of 7 is considered:
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A pH of 5 is how many times more acidic than a pH of 6?
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What is a negatively charged ion called?
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On the pH scale, numbers less than 7 indicate a(n):
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What kind of substance does pH indicate the acidity or alkalinity of?
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Study Notes
pH and Its Significance
- pH represents potential hydrogen, a measure of the acidity or alkalinity of a solution.
- Solutions with lower pH (below 7) are acidic, while those above 7 are alkaline.
- A pH of 7 is considered neutral, indicating an equal concentration of hydrogen and hydroxide ions.
Properties of Acids and Alkalis
- Acids typically taste sour, while alkalis have a bitter taste.
- In an alkali solution, red litmus paper turns blue.
- Blue litmus paper turns red when exposed to an acid.
pH Scale Details
- The pH scale is logarithmic; each whole number change represents a tenfold change in acidity or alkalinity.
- A pH of 5 is ten times more acidic than a pH of 6, indicating how slight changes can significantly affect acidity.
- A common misconception is that values below 7 indicate more alkalinity; they actually signify increased acidity.
Biological Relevance
- The pH range for hair, skin, and nails typically falls between 4.5 to 5.5, which is slightly acidic.
- Distilled water is neutral with a pH of 7 and serves as the primary ingredient in many skincare products.
Ion Balance in Solutions
- Anions are negatively charged ions, while cations are positively charged ions; their balance determines the solution's pH.
- An alkaline solution contains more negative hydroxide ions than positive hydrogen ions.
Summary of Terminology
- An acidic solution is identified by a pH less than 7, whereas an alkaline solution has a pH greater than 7.
- Water is a crucial solvent, dissolving both acidic and alkaline substances.
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Description
Test your knowledge of pH and its significance in chemistry with these flashcards. This quiz covers essential concepts such as the effect of alkali in water, the meaning of pH, and the color changes in litmus testing. Perfect for students looking to reinforce their understanding of acid-base chemistry.
