Acids and Bases

[the prodogy]

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I was wondering how you determine how basic or acidic something is. I know know the main rules on how to determine whether something is a strong acid or a strong base, but when you get down to both being weak bases, how do you know which is stronger? For example, how do you know which would be the strongest/weakest base out of this group:
NaC2H3O2
Na2CO3
NaCl
NH4Cl

Wouldn't all be considered a weak base?

 

[doc toothache]

I was wondering how you determine how basic or acidic something is. I know know the main rules on how to determine whether something is a strong acid or a strong base, but when you get down to both being weak bases, how do you know which is stronger? For example, how do you know which would be the strongest/weakest base out of this group:
NaC2H3O2
Na2CO3
NaCl
NH4Cl

Wouldn't all be considered a weak base?

Na acetate= strong base/weak acid= basic
Na carbonate= strong base, weak acid=basic
NaCl= ionic salt= neutral
NH4Cl= weak base/strong acid= acidic

Acetic acid has a lower pH than carbonic acid; therefore expect sodium carbonate to be more basic than sodium acetate.