Is it permissible to give charity with the intention of purifying oneself from doubtful debts, knowing that the trustee of the company confirmed that there are no debts and no one has claimed them, and can an amount be estimated and given as charity to clear one's financial liability?

The fundamental principle is the presumption of innocence (freedom from obligation), and one is not required to give charity on behalf of a right that has not been established as an obligation. However, there is no harm in giving charity with that intention. If, thereafter, the rightful owner appears, his right is not forfeited by what has been done.