Dissociation constants of acids: HOAc Ka=1.78x10-5 H2SO4 Ka1=1x107 Ka2=1.0x10-2
ID: 1021095 • Letter: D
Question
Dissociation constants of acids: HOAc Ka=1.78x10-5 H2SO4 Ka1=1x107 Ka2=1.0x10-2 HCNO Ka=2x10-4 H2CO3 Ka1=4.3x10-7 Ka2=5.6x10-11 H2O Ka=1.0x10-14 HIO Ka=2.3x10-11 HIO3 Ka = 1.7x10-4 HCl Ka=1x108 HNO3 Ka=1x106 HF Ka = 3.5x10-4 H2C2O4 Ka1 = 6.0x10-2 Ka2 = 6.1x10-5 Dissociation constants of bases: NH3 Kb=1.76x10-5 CH3NH2 Kb=4.4x10-4 HONH2 Kb=1.1x10-8 C2H5NH2 Kb = 5.6x10-4
7a- I mix 500 mL of 0.250 M HCNO with 250 mL of 0.333 M NaCNO. What is the concentration of HCNO?
7b-I mix 500 mL of 0.250 M HCNO with 250 mL of 0.333 M NaCNO. What is the concentration of CNO- ?
7c-I mix 500 mL of 0.250 M HCNO with 250 mL of 0.333 M NaCNO. Construct the ICE chart for the Ka reaction of HCNO for this particular mixture. [Don’t solve, just set it up.]
Explanation / Answer
Initial Final
M1 = 0.25M M2 =
V1 = 500ml V2 = 500+250 = 750ml
M1V1 = M2V2
M2 = M1V1/M2
= 0.25*500/750 = 0.166M
7b .
Initial Final
M1 = 0.333M M2 =
V1 = 250ml V2 = 500+250 = 750ml
M1V1 = M2V2
M2 = M1V1/M2
= 0.33*250/750 = 0.11M