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Cl- does not affect the pH of a solution because Cl- is a really stable atom; it does not need to bind to a Hydrogen. While NH3- is a weak base so it's conjugate acid, NH4 will lose a few Hydrogens in the NH4 and act as an acid by donating its extra Hydrogen.
Cl- ion does not affect pH of water because it is a stable ion. It will not tend to bind to hydrogen atoms in water because itself is already stable. Therefore it will not cause any change in pH. And typically group one and group two cations metals are neutral.
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