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How many grams of solid sodium cyanide should be added to 0.500 L of a 0.121 M hydrocyanic acid solution to prepare a buffer with

How many grams of solid sodium cyanide should be added to 0.500 L of a 0.121 M hydrocyanic acid solution to prepare a buffer with a pH of 8.538 ?

grams sodium cyanide = g.

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