The pH of a solution changes from 8 to 5 - HSC - SSCE Chemistry - Question 6 - 2023 - Paper 1
Question 6
The pH of a solution changes from 8 to 5.
What happens to the concentration of hydrogen ions during this change of pH?
A. It increases by a factor of 3.
B. It decrea... show full transcript
Worked Solution & Example Answer:The pH of a solution changes from 8 to 5 - HSC - SSCE Chemistry - Question 6 - 2023 - Paper 1
Step 1
What is the change in pH?
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Answer
The initial pH is 8 and the final pH is 5. To find the change in pH, we calculate:
extChangeinpH=5−8=−3
Step 2
What is the relationship between pH and hydrogen ion concentration?
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Answer
The pH of a solution is related to the concentration of hydrogen ions ext{[H+]} by the equation:
ext{pH} = - ext{log}[ ext{H$^+$}]
A decrease in pH indicates an increase in the concentration of hydrogen ions.
Step 3
Calculate the factor change in hydrogen ion concentration.
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Answer
Since the pH decreases by 3 units, we can determine how many times the hydrogen ion concentration increases using:
extFactor=10extchangeinpH=10∣−3∣=1000
Thus, the concentration of hydrogen ions increases by a factor of 1000.
Step 4
Conclusion
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Answer
Therefore, the correct answer is C: It increases by a factor of 1000.
