Given below is the incomplete equation for the extraction process of gold using potassium cyanide. Identify the missing reagent.

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Given below is the incomplete equation for the extraction process of gold using potassium cyanide. Identify the missing reagent.<br><img src='https://www.fatskills.com/images2/chemistry-questions-answers-importance-applications-coordination-compounds-q3.png' alt='Find the extraction process of gold using potassium cyanide from given diagram' width='574' height='48' class='268726' />