MabelArtsfreak
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Report Thread starter 6 years ago
#1
I was looking for pH of PCl5 and NaCl, then I have this curious question whereby are all ions neutral? Is that how you remember pH(s) for ions? I have bad memory and I'm trying to remember the pH(s) of molecules.

At the same time, I would like to ask:
Is there a way to remember the properties, reactivity of oxide, carbonate, hydroxide with water and oxygen, melting point, of period 3, group 2 and 7?
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username1445490
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Not all solutions containing ions have a neutral pH.
If the ions react with water they can be acidic or basic.

NH4+ reacts with water to form NH3 + H3O+ and so is acidic
CH3COO- reacts with water to form CH3COOH + OH- and so is basic.

In general the salt of a weak acid is basic and the salt of a weak base is acidic.

The only way to learn the properties of group 2, group 7 and period 3 is to tabulate them and memorise them
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MabelArtsfreak
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(Original post by Madasahatter)
In general the salt of a weak acid is basic and the salt of a weak base is acidic.
How do I know the difference of a strong or weak acid(/base)?
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Borek
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There is no such thing as pH of an ion, pH is a property of a solution, not of an ion.

To be able to calculate pH you need to know what ions are present and in what concentrations.
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