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To answer this you need a roman numeral on gold to know the charge on it. Assuming it would be (I)... the formula would be KAu(CN)2
Yes, a 0.1 M solution of KCN will have a pH greater than 7.0. Potassium cyanide (KCN) produces hydroxide ions when dissolved in water, leading to an increase in pH above 7.0.
KCN does not react with aldehydes and ketones because these compounds do not have an acidic hydrogen that can be removed to form an enolate ion, which is necessary for nucleophilic addition reactions with cyanide ions. Aldehydes and ketones lack the necessary alpha carbon acidity to undergo this reaction with KCN.
KCN broth is a complex medium typically made from organic ingredients like meat extracts or peptones. It is not a synthetic medium composed of defined chemicals.
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