To answer your questions about the pH scale:
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Which is more acidic: This would depend on specific substances given, but in general, substances with a lower pH (below 7) are more acidic. For example, a substance with a pH of 3 is more acidic than a substance with a pH of 5.
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Which is more basic (alkaline): Similarly, substances with a higher pH (above 7) are more basic. For instance, a substance with a pH of 12 is more basic than one with a pH of 9.
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What is the only neutral substance: The only neutral substance on the pH scale is pure water (H2O), which has a pH of 7.
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What is the strongest acid on the pH scale shown above: The strongest acid on the pH scale is typically represented by a pH of 0. This could be concentrated hydrochloric acid or similar strong acids, which have very low pH values.
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What is the strongest base on the pH scale shown above: The strongest base would be a substance with a pH of 14, which is typical for sodium hydroxide (NaOH) or similar strong bases.
If you have specific values or substances in mind, please provide them for more detailed answers.