X and Y are solutions of two different acids - Edexcel - GCSE Chemistry Combined Science - Question 6 - 2019 - Paper 1
Question 6
X and Y are solutions of two different acids.
The concentration of acid in each solution, in mol dm^-3, is the same.
Solution X has a pH of 3.40 and solution Y has... show full transcript
Worked Solution & Example Answer:X and Y are solutions of two different acids - Edexcel - GCSE Chemistry Combined Science - Question 6 - 2019 - Paper 1
Step 1
State what could be used to measure these pH values of 3.40 and 4.40.
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Answer
A pH meter or pH probe can be used to accurately measure the pH values of the solutions. These devices provide precise readings and eliminate human error associated with indicators.
Step 2
What is the concentration of hydrogen ions in solution X compared with that in solution Y?
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Answer
The concentration of hydrogen ions
is related to pH by the formula:
[H+]=10−pH
For Solution X (pH 3.40):
[H+]=10−3.40
For Solution Y (pH 4.40):
[H+]=10−4.40
To compare the two concentrations:
[H+]Y[H+]X=10−4.4010−3.40=10(4.40−3.40)=101=10
Thus, the concentration of hydrogen ions in solution X is ten times higher than that in solution Y.
