What Mass of Sodium Cyanide Must Be Added to 250

question 107

Multiple Choice

What mass of sodium cyanide must be added to 250. mL of water in order to obtain a solution having a pH of 10.50? [K_a(HCN) = 4.9 * 10^-10]

• A) 240 g
• B) 0.032 g
• C) 0.059 g
• D) 0.94 g
• E) 0.24 g

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