NH4F is a salt of weak acid HF (Ka = 7.2 $\times$ 10–4) and weak base NH4OH (Kb = 1.8 $\times$ 10–5), the solution of NH4F will be ______.

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NH4F is a salt of weak acid HF (Ka = 7.2 $\times$ 10–4) and weak base NH4OH (Kb = 1.8 $\times$ 10–5), the solution of NH4F will be slightly acidic.

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