What Mass of Sodium Cyanide Must Be Added to 250

question 153

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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