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. On this ____ day of. , 20____, before me,. 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 notary acknowledgment form lets a notary public confirm the legitimacy of the signing party's signature and prevents forgery on legal documents. State of Washington.