10. Find the pH of a buffer prepared by mixing 200.0 mL of 0.200 M NaCN with 400.0 mL of 0.150 M HCN. K. (HCN) 4,00 x 10-10 [3 marks]

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An aqueous buffer solution is made by adding 50.0 mL of 4.00 M NaCN to 30.0 mL of 5.00 M HCN. (K_a for HCN = 4.9*10^-10). In order to adjust to a pH of 9.72, how many milliliters of 3.50 M NaOH should be added?

You are asked to prepare a pH=9.60 buffer starting from 500 ml of 0.10 M solution of hydrocyanic acid, HCN, and express sodium cyanide, NaCN (K_a for HCN = 4.9 x 10 ^-4 )

a) What is the pH of the hydrocyanic acid solution prior to adding NaCN?

b) How many grams of NaCN should be added to prepare the buffer solution?