How can solutions of different metal nitrates at the same concentration have the same pH value?
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As the title suggests, I want to conduct adsorption experiments with different metal cations. Because at the same concentration, the pH values of different metal nitrates must be different. If an alkaline solution is added to the solution, its volume will change, and the concentration of the metal salt solution will also change. Initially, if one wants to ensure that each metal nitrate solution has the same pH at the same concentration, what methods can be used to achieve this?
Personally, I think nitric acid should be added for adjustment; the pH value is determined by the activity of the anions, and adding alkali leads to a neutralization reaction
So if the pH of my nitrates is low, how can I raise it?
It is feasible to adjust the pH of a nitrate solution to a more acidic level. However, due to the hydrolysis of many metal ions, adjusting the pH value toward alkalinity is greatly restricted; in fact, some salts hydrolyze even without the addition of a base. This situation requires calculation based on the hydrolysis and precipitation of different metal ions before it can be adjusted. It is possible to look up information on your own, or to pay someone more qualified to do the calculations for you.
Well, your analysis is very accurate; thank you.