For an acknowledgment in a representative capacity: State of Washington. An acknowledgment is one of the most common types of notarial acts, but it often confuses Notaries.Here are 5 steps to performing an acknowledgment. A Washington notary acknowledgment form lets a notary public confirm the legitimacy of the signing party's signature and prevents forgery on legal documents. This 5-step guide will teach you how to notarize a document that requires an acknowledgement (the most common notarial act). A Washington notary acknowledgment form is used to officially authenticate a signature on a legal document. Use the samples below to develop or update acknowledgment language for your own use when thanking donors for gifts to your department or center. A Washington DC notary acknowledgment form verifies that the signatures included on a document are valid. In the samples below, we say "Native people," but you should fill in the tribes of your region. The Washington Notary Acknowledgement forms are documents used to prove the validity of a signature on a legal document.