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Tollen's test is an important test to distinguish between aldehydes and ketones.

$$\ce{2[Ag(NH_3)_2]^+ + RCHO + H_2O → 2Ag(s) + 4NH_3 + RCO_2H + 2H^+}$$

But is this reaction safe? Is there any threat in the formation of silver nitride (fulminating silver)? It is formed when the products of most of the reactions of silver($\ce{I}$) salts are kept aside undisturbed. It acts as a potential explosive or a contact explosive. If there is any threat in the formation of silver nitride, what precaution must be taken to prevent it?

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    $\begingroup$ Great question - In general I'd say that not enough attention is given to safety. A good chemist has a plan to dispose of excess reagents as well as the various waste reaction products. $\endgroup$
    – MaxW
    Commented Jan 8, 2016 at 18:14
  • $\begingroup$ The reaction is with micro moles of reactant generated insitu and usually completely reacted as a confirmatory test. Were it to be used as a preparatory reaction to convert aldehyde to acid or to silver plate mirrors safety must be secured. In any chemical endeavor waste disposal is a hazardous process. The first step is to minimize waste. $\endgroup$
    – jimchmst
    Commented Jul 11 at 20:01

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The Tollen's test is safe, but silver amine solutions should be prepared as needed just before use. The formation of explosive silver nitride is a slow process and can be prevented by treating the solution with mineral acid after use.

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    $\begingroup$ I agree, but it would be nice if you add an equation or link and elaborate a little $\endgroup$
    – Mithoron
    Commented Jan 8, 2016 at 17:20
  • $\begingroup$ See here for a more detailed answer. $\endgroup$
    – Nilay Ghosh
    Commented Feb 4, 2021 at 10:10

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