If the pH of the mouth falls below 5, what situation develops for the teeth?
Answer and explanation
Correct answer: A harmful acidic condition for tooth enamel
pH is an inverse measure of hydrogen-ion concentration, so a value below 5 indicates a strongly acidic environment. Tooth enamel begins to be threatened when the mouth becomes sufficiently acidic, because its mineral can dissolve by demineralisation. Therefore a pH below 5 represents a harmful acidic condition and increases the risk of tooth decay. It is not basic, neutral, or chemically harmless, so option A is correct.
Frequently asked questions
What is the correct answer to this question?
A harmful acidic condition for tooth enamel
Why is this the correct answer?
pH is an inverse measure of hydrogen-ion concentration, so a value below 5 indicates a strongly acidic environment. Tooth enamel begins to be threatened when the mouth becomes sufficiently acidic, because its mineral can dissolve by demineralisation. Therefore a pH below 5 represents a harmful acidic condition and increases the risk of tooth decay. It is not basic, neutral, or chemically harmless, so option A is correct.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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