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The pH scale runs from 0 to 14. Pure water has a pH of 7, the half-way point of the pH scale. A pH between 0 and 7 indicates that a solution is acidic, and the lower the pH, the higher the acidity. A pH between 7 and 14 indicates that a substance is alkaline, and the higher the pH, the higher the strength of the alkali.
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Which has the greater concentration of hydrogen ions a substance with a pH of 5 or a substance with a pH of 4?
A substance with a pH of 4 has a greater concentration of hydrogen ions compared to a substance with a pH of 5. The pH scale is logarithmic, so each decrease in pH by 1 represents a tenfold increase in hydrogen ion concentration.
A substance with a pH of 11 is what times more what than a substance with a pH of 8?
A substance with a pH of 11 is 1000 times more basic than a substance with a pH of 8. This is because the pH scale is logarithmic, with each unit representing a tenfold difference in hydrogen ion concentration.
What is the difference between the pH and pI values of a substance and how do they affect its properties?
The pH value of a substance indicates its acidity or basicity, while the pI value is the pH at which a molecule carries no net charge. The pH affects the solubility and reactivity of a substance, while the pI influences its stability and interactions with other molecules.
What is an acid and base?
An acid base indicator is a substance that changes colour due the PH of the medium in which it is dissolved.
Why are acidic substances lower in pH value than basic substances?
Acidic substances have higher concentrations of hydrogen ions (H+) which results in a lower pH value compared to basic (alkaline) substances. A lower pH value indicates a higher concentration of H+ ions, while a higher pH value indicates a higher concentration of hydroxide ions (OH-) found in basic substances.
