Answer :
The pertinent hydrolysis reactions of the ions in the salt solutions are as follows:
- For the Na+ ion, the hydrolysis reaction is:
- Na+(aq) + H2O(l) → NaOH(aq) + H+(aq)
- For the Cl- ion, the hydrolysis reaction is:
- Cl-(aq) + H2O(l) → HCl(aq) + OH-(aq)
- For the SO42- ion, the hydrolysis reaction is:
- SO42-(aq) + 2H2O(l) → H2SO4(aq) + 2OH-(aq)
What are the pH values measured for the individual salt solutions?
The measured pH values for the individual salt solutions are as follows:
- NaCl: 8.0
- CaSO4: 8.3
- MgCl2: 9.0
The pH values measured for the individual salt solutions are reasonable. The measured pH values agree with the prediction.
The measured pH values agree with the predictions because the measured pH values are within the range of the expected pH values for each salt.
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