Question 64 of 68 What ratio of NaCN to HCN is needed to prepare a pH...
Question 41 of 68 What is the pH of a 0.0710 M solution of hydrocyanic acid, HCN (Ka = 4.9 x 10/1)? 1 2 3 7 8 9 +/- x 100
18. You are asked to prepare a pH = 8.60 buffer starting from 500 mL of 0.10 M solution of hydrocyanic acid, HCN, and excess sodium cyanide, NACN. (Ka for HCN = 4.9 x 10-10) 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?
You are asked to prepare 2.9 L of a HCN/NaCN buffer that has a pH of 9.79 and an osmotic pressure of 1.79 atm at 298 K. What masses of HCN and NaCN should you use to prepare the buffer? (Assume complete dissociation of NaCN.)
You are asked to prepare 1.0 L of a HCN/NaCN buffer that has a pH of 9.86 and an osmotic pressure of 1.97 atm at 298 K. What masses of HCN and NaCN should you use to prepare the buffer? (Assume complete dissociation of NaCN.)
You are asked to prepare 3.8 L of a HCN/NaCN buffer that has a pH of 9.62 and an osmotic pressure of 1.39 atm at 298 K. What masses of HCN and NaCN should you use to prepare the buffer? (Assume complete dissociation of NaCN.)
Question 6 of 12 Submit What is the pH of a 0.0550 M solution of hydrocyanic acid, HCN (Ka = 4.9 x 10-10)? 1 4 7 +/- 2 5 8 : 3 6 9 0 x 10
What molar ratio of sodium cyanide to hydrocyanic acid is necessary to prepare a buffer with pH = 9.72? Ka of HCN = 4.9 x 10-10
You are asked to prepare 4.0 L of a HCN/NaCN buffer that has a pH of 9.62 and an osmotic pressure of 1.45 atm at 298 K. Part A What masses of HCN and NaCN should you use to prepare the buffer? (Assume complete dissociation of NaCN.) Express your answers using two significant figures separated by a comma.
Calculate the volumes of 0.200 M hydrocyanic acid, HCN (Ka = 4.9 x 10–10) solution, and 0.200 M of sodium cyanide, NaCN, solution needed to prepare 100.0 mL buffer solution with pH = 9.5
What concentration of NaCN must be added to a 0.5 M HCN solution to produce a buffer solution with pH 7.0? Ka = 6.2 x 10–10 for HCN a) 3.3 M b) 0.49 M c) 6.9 x 10-5 M d) 0.0031 M e) 0.22 M