Name: Pre-Lab Questions 1. write a reversible reaction for the buffer decomposition of NH4* into ammonia (NH3) and Ht ion NHq" laq) = NH3 (ag) + H *C0g 2. What side will the reaction from #1 shift to when HCl is added to the solution? NH3 is a base ond HCI IS on acid. NH3 lag) +HC (aq) NA4 SniFIS in the direction of reactant, NH 3. What side will the reaction from #1 shift to when LIOH is added to the solution? to left. > H2 O When Li OH i9 added it consumes H the reaction will shift towards for ward/right direction H t -HO 4. What is the pKa of the NHa" ion? This will be used in the laboratory. The pha of NHy is 9.26 5. Calculate the pH of a NH4* buffer system when 40.0 mL of 0.1 M NH3 is mixed with 40.0 mL of a 0.001 M NH4CI. The standard Value for Kb Of NH3= 1.8 x10 5 pOH -pKot 1og [NHy ] [N H3] pOH = - 109(1.8x 10 5) + log (901) > 2.7447 POH : PH= 14-pOH = 11. 255 6. Calculate the pH of a NH4* buffer system when 20.0 mL of 0.10 M NH3 is mixed with 10.0 mL of a pkb = -1ogkb 11.26 0.10 M NH4CI. 7. Calculate the pH of a NH4* buffer system when 10.0 mL of 0.10 M NH3 is mixed with 10.0 mL of a 0.010 M NH.CI. The d for the For (NHN tionnd ce h the soos BufferLab-5

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Pre-Lab Questions
. write a reversible reaction for the buffer decomposition of NH4* into ammonia (NH3) and H† ion
NHq" laq)
= NH3 (ag) + H *C0g
2. What side will the reaction from #1 shift to when HCl is added to the solution?
NA3IS a base ond HCI IS on acid.
NH3 lag) +HC (aq) > N
SniFIs in the direction of reactant, NH
3. What side will the reaction from #1 shift to when LIOH is added to the solution?
to left.
> H2 O
When Li OH i9 added it consumes H
the reaction will shift towards for ward/right direction
H t -HQ
4. What is the pKa of the NHa* ion? This will be used in the laboratory.
The pha of NHy is 9.26
5. Calculate the pH of a NH4* buffer system when 40.0 mL of 0.1 M NH3 is mixed with 40.0 mL of a
0.001 M NH4CI.
The standard value forKb OF NH3= 1,8 X10-5
pOH •pKbt log [NHy]
[N H3]
pOH = - 199(1.8x 10 5) + log (901)
pkb = -1ogkb
POH :
2 2.7447
DH = 14- pOH = II. 255 = |1.26
6. Calculate the pH of a NH4* buffer system when 20.0 mL of 0.10 M NH3 is mixed with 10.0 mL of a
0.10 M NHẠCI.
7. Calculate the pH of a NH4* buffer system when 10.0 mL of 0.10 M NH3 is mixed with 10.0 mL of a
0.010 M NH4CI.
The/sd for the
For
(NH
guation nd ch
h o the s os
BufferLab-5
Transcribed Image Text:Name: Pre-Lab Questions . write a reversible reaction for the buffer decomposition of NH4* into ammonia (NH3) and H† ion NHq" laq) = NH3 (ag) + H *C0g 2. What side will the reaction from #1 shift to when HCl is added to the solution? NA3IS a base ond HCI IS on acid. NH3 lag) +HC (aq) > N SniFIs in the direction of reactant, NH 3. What side will the reaction from #1 shift to when LIOH is added to the solution? to left. > H2 O When Li OH i9 added it consumes H the reaction will shift towards for ward/right direction H t -HQ 4. What is the pKa of the NHa* ion? This will be used in the laboratory. The pha of NHy is 9.26 5. Calculate the pH of a NH4* buffer system when 40.0 mL of 0.1 M NH3 is mixed with 40.0 mL of a 0.001 M NH4CI. The standard value forKb OF NH3= 1,8 X10-5 pOH •pKbt log [NHy] [N H3] pOH = - 199(1.8x 10 5) + log (901) pkb = -1ogkb POH : 2 2.7447 DH = 14- pOH = II. 255 = |1.26 6. Calculate the pH of a NH4* buffer system when 20.0 mL of 0.10 M NH3 is mixed with 10.0 mL of a 0.10 M NHẠCI. 7. Calculate the pH of a NH4* buffer system when 10.0 mL of 0.10 M NH3 is mixed with 10.0 mL of a 0.010 M NH4CI. The/sd for the For (NH guation nd ch h o the s os BufferLab-5
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