State of Washington. This article and video will show Notaries to fill out each part of a notarial certificate, and common mistakes to avoid.Create a notarized letter with critical components, legal tips, and an example template. A Washington notary acknowledgment form is used to officially authenticate a signature on a legal document. Download a notary acknowledgment form in PDF or Word format. Can you write a letter and have it notarized? 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. An essential element to performing a notarial act is completing the notarial certificate, where your signature and seal will be placed. The Washington Individual Notary Acknowledgement form is a document used to prove that a signature on a legal instrument is legitimate.