13. Calculating the composition of a buffer of a given pH. a) Kb=5.4*10-4 125mL of 0.90M...
12. Calculating pH of a buffer. a) A solution is prepared that is initially 0.44M in HNO2 and 0.093M in KNO2. Ka=4.5*10-4. Calculate pH. b) A solution is prepared that is initially 0.49M in CH3NH2 and 0.33 in CH3NH3CI. Kb=4.4*10-4. Calculate pH.
Calculating the composition of a buffer of a given pH . What mass of A chemistry graduate student is given 100 mL of a 0.40 M nitrous acid (HNO) solution. Nitrous acid is a weak acid with K =4.5 10 KNO, should the student dissolve in the HNO, solution to turn it into a buffer with pH = 3.46? You may assume that the volume of the solution doesn't change when the KNO, is dissolved in it. Be sure your...
ACDS AND BASES Calculating the composition of a buffer of a given pH A chemistry graduate student is given 450 ml. of a 0.50 M chloroacetic acid (HCH,CICO,) solution. Chloroacetic acid is a weak acid with What mass of NCH,CICO, should the student dissolve in the HCH.CICO, solution to turn it into a buffer with pH 2.76? 1.310 You may assume that the volume of the solution doesn't change when the NaCH.CICO, is dissolved in it. Be sure your answer...
O ACIDS AND BASES Calculating the composition of a buffer of a given pH A chemistry graduate student is given 500 ml of a 0.40 M trimethylamine (CH) N) solution. Trimethylamine is a weak base with K = 7,410 . What mass of (CH) NHCI should the student dissolve in the (CH) N solution to turn it into a buffer with pH = 11.12? You may assume that the volume of the solution doesn't change when the (CH) NHCl is...
O ACIDS AND BASES Calculating the composition of a butter of a given pH OOOOO Lauren What A chemistry graduate student is given 125 ml of a 1.50 M benzoic acid (HCH.CO) solution. Benzoic acid is a weak acid with K = 6,3 x 10 mass of NC 11.00, should the student dissolve in the HC H.CO, solution to turn it into a buffer with pH 4337 You may assume that the volume of the solution doesn't change when the...
A chemistry graduate student is given 450. mL of a 0.90 M nitrous acid (HNO2) solution. Nitrous acid is a weak acid with K-4.5x10 . What mass o KNO2 should the student dissolve in the HNO2 solution to turn it into a buffer with pH-3.20? You may assume that the volume of the solution doesn't change when the KNO2 is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.
A chemistry graduate student is given 125. mL of a 0.90 M nitrous acid (HNO2) solution. Nitrous acid is a weak acid with Ka = 4.5 x 10-4. What mass of KNO, should the student dissolve in the HNO2 solution to turn it into a buffer with pH = 3.18? You may assume that the volume of the solution doesn't change when the KNO, is dissolved in it. Be sure your answer has a unit symbol, and round it to...
A chemistry graduate student is given 125.mL of a 1.40M chloroacetic acid HCH2ClCO2 solution. Chloroacetic acid is a weak acid with =Ka×1.310−3. What mass of KCH2ClCO2 should the student dissolve in the HCH2ClCO2 solution to turn it into a buffer with pH =2.97? You may assume that the volume of the solution doesn't change when the KCH2ClCO2 is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.
A chemistry graduate student is given 250.mL of a 0.60M ammonia NH3 solution. Ammonia is a weak base with =Kb×1.810−5. What mass of NH4Br should the student dissolve in the NH3 solution to turn it into a buffer with pH =9.35?
A chemistry graduate student is given 125. mL of a 1.70 M chlorous acid (HNO2) solution. Chlorous acid is a weak acid with Ka= 1.1 x 10^-2. What mass of NaClO2 should the student dissolve in the HClO2 solution to turn it into a buffer with pH = 2.48? You may assume that the volume of the solution doesn't change when the NaClO2 is dissolved in it. Be sure your answer has a unit symbol, and round it to 2...