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 1.0 L of a HCN/NaCN buffer that has a pH of...
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 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.)
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.
You are asked to prepare 2.3 L of a HCN/NaCNbuffer that has a pH of 9.63 and an osmotic pressure of 1.30 atm at 298 K. What masses of HCN and NaCN should you use to prepare the buffer? (Assume complete dissociation of NaCN.
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?
In the buffer lab, students were asked to prepare a phosphate buffer given a target pH. Malic acid (H2C4H4O5, Mr = 134.088 g/mol) is a diprotic acid in which the pKa1 for dissociation of the first proton is 3.40 and the pKa2 for dissociation of the second proton is 5.11. In a similar scenario, given 1.650 grams of NaHC4H4O5 (Mr = 156.070 g/mol), prepare 100.0 mL of a pH = 3.75 buffer. Determine the identity and mass of material needed...
Showing work, please answer questions a and b, thank you! 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) 18. What is the pH of the hydrocyanic acid solution prior to adding NaCN? a) b) How many grams of NaCN should be added to prepare the buffer solution?
Question 64 of 68 What ratio of NaCN to HCN is needed to prepare a pH 9.80 buffer? (Ka of HCN is 4.9 x 10) 4 5 6 7 8 9 +/- : 0 x 100
A 1.0 L buffer solution has 0.15 mol L-'HCN and 0.60 mol L-1 KCN. The K, of HCN is 4.9 X 10-10. Which action will destroy the buffer? A. Add 0.50 mol HCN to the buffer. B. Add 0.50 mol KCN to the buffer. C. Add 0.50 mol HCl to the buffer. D. Add 0.50 mol KOH to the buffer. E. More than one of the above will destroy the buffer. (Hint: write some chemical equations & use stoichiometry!)
3. How much solid NaCN must be added to 1.0 L of a 0.5 MHCN solution to produce a solution with pH 7.0? K. - 6.2 x 10- for HCN. K 4. The following table shows many acid/base pairs with the corresponding K, values on the right. ACID/BASE 1.0 M NaHSO4/ 1.0M Na2SO4 1.2 x 10-2 1.0M HCIO/ 1.0M KCIO 3.5 x 10- 1.0M NH4Cl 1,0M NHI 5.6 x 10-10 1.0M (CH3)2NHCI/1.0M (CH3)2N 1.5 x 10-10 1.0M Na2HPO4/ 1.0M Na...