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Question
Chemistry
Posted 8 months ago

The following are simplified representations of three acids with the same concentration. Although they contain the same amount of solute in the same volume of solution, the pH\mathrm{pH} of each solution varies considerably.
Solution A
Solution B
Solution C
Key
\bigcirc HA
AA^{-}
o
H+\mathrm{H}^{+}
Using the information above, order the solutions from lowest pH\mathrm{pH} to highest pH\mathrm{pH}.

Low pH\mathrm{pH}
\rightarrow
High pH\mathrm{pH}
Solution A
Solution B
Solution C
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Answer from Sia
Posted 8 months ago
Solution
1
Identify the reaction: The pH of a solution is a measure of its acidity or alkalinity, which is based on the concentration of hydrogen ions (H+\mathrm{H}^{+})
2
Analyze Solution A: Solution A contains 5 HA, 1 A^{-}, and 3 H+\mathrm{H}^{+}. The presence of 3 H+\mathrm{H}^{+} ions indicates a relatively high concentration of hydrogen ions, suggesting a lower pH
3
Analyze Solution B: Solution B contains 3 HA, 4 A^{-}, and 3 H+\mathrm{H}^{+}. The presence of 3 H+\mathrm{H}^{+} ions is the same as in Solution A, but the higher number of A^{-} ions suggests a slightly higher pH than Solution A
4
Analyze Solution C: Solution C contains 2 HA, 5 A^{-}, and 2 H+\mathrm{H}^{+}. The presence of 2 H+\mathrm{H}^{+} ions indicates a lower concentration of hydrogen ions compared to Solutions A and B, suggesting a higher pH
5
Order the solutions: Based on the analysis, the order from lowest pH to highest pH is: Solution A, Solution B, Solution C
Answer
Solution A, Solution B, Solution C
Key Concept
pH is determined by the concentration of hydrogen ions (H+\mathrm{H}^{+}) in the solution.
Explanation
The solution with the highest concentration of H+\mathrm{H}^{+} ions will have the lowest pH, and the solution with the lowest concentration of H+\mathrm{H}^{+} ions will have the highest pH.

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