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Question:

AlF3 is soluble in HF only in the presence of KF. It is due to the formation of:

AlH3

K3[AlF3H3]

K[AlF3H]

K3[AlF6]

Solution:

Aluminium forms fluoride complexes more easily than in the case of silicon. So, AlF3 easily dissolves in a mixture of (HF+KF).