For general information and quick lookups:
* PubChem: A vast database maintained by the National Institutes of Health (NIH) that contains chemical information, including pH values for some salts. It's a good starting point for basic information. [https://pubchem.ncbi.nlm.nih.gov/](https://pubchem.ncbi.nlm.nih.gov/)
* Wikipedia: Often has basic information on common salts, including their pH values. [https://www.wikipedia.org/](https://www.wikipedia.org/)
* ChemSpider: Another large database of chemical information that can be useful for finding pH values. [https://www.chemspider.com/](https://www.chemspider.com/)
For more detailed information and calculations:
* CRC Handbook of Chemistry and Physics: This comprehensive reference book is often found in libraries and provides detailed physical and chemical data, including pH values for a wide range of salts.
* NIST Chemistry WebBook: This database from the National Institute of Standards and Technology (NIST) contains a wealth of thermodynamic data, including dissociation constants (pKa) which can be used to calculate pH values for salts. [https://webbook.nist.gov/chemistry/](https://webbook.nist.gov/chemistry/)
* Scientific databases: Many scientific journals and databases may contain specific data on the pH of salts. For example, databases like Reaxys or SciFinder can be useful if you have a specific salt in mind.
Remember:
* pH values of salts are dependent on their concentration: The pH of a salt solution changes with its concentration. Look for information specific to the concentration you are interested in.
* Salts can have different pH values depending on the temperature: Check if the information you find is at the temperature you need.
* Some salts may not have a specific pH value: Some salts are very weak acids or bases, and their pH values may be very close to neutral (pH 7).
If you can't find the information you need online, consider:
* Consulting a chemistry textbook or reference book: They often contain tables of pH values for common salts.
* Asking a chemistry teacher or professor: They can guide you to the best resources and help you understand how to calculate pH values.
Remember, using multiple sources and checking for consistency in the data is always a good practice.
