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115 Cards in this Set
- Front
- Back
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Standard Deviation equation
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((sum(xi-xavg)^2)/(n-1))^1/2
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What is the uncertainty of z when z=a+b?
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Uz= (Ua^2+Ub^2)^1/2
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What is the uncertainty of z when z=a-b?
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Uz= (Ua^2+Ub^2)^1/2
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What is the uncertainty of z when z=a/b?
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Uz=z((Ua/a)^2+(Ub/b)^2)^1/2
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What is the uncertainty of z when z=axb?
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Uz=z((Ua/a)^2+(Ub/b)^2)^1/2
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Relative Uncertainty = ?
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Absolute Uncertainty/measured value
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Qobs =?
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gap/range
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What is the uncertainty of z when z=lna?
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Uz=Ua/a
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What is the uncertainty of z when z=exp(a)?
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Uz=z*Ua
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What is the uncertainty of z when z=10^a?
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Uz=2.303*z*Ua
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What is the uncertainty of z when z=loga?
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Uz=Ua/(2.303a)
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What is the standard of deviation a measurement of?
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Precision
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What is RSD?
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Relative Standard Deviation
= Standard Deviation/avg |
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What is %RSD?
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%Relative Standard Deviation
= RSDx100 |
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What in the air reacts with solutions of NaOH?
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CO2
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Is Na2CO3 soluble in 50% NaOH?
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No
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To minimize errors in titrations, what should you do?
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Use large amounts of titrant.
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What is phenolphthalein?
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Indicator
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What is a good way to reduce Fe (III) to Fe (II)?
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Use Zn.
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What does (en) stand for?
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ethylenadiamine
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What are the the group 1 cations?
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Pb2+, Ab+, Hg22+
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Ag+ + HCl -->
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AgCl
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Hg22+ + HCl-->
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Hg2Cl2
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Pb2+ +HCl-->
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PbCl2
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What color is PbCl2?
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White
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What color is Hg2Cl2?
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White
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What color is AgCl?
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White
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What color is silver sulfide?
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Black
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What does AgCl look like?
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curdy white ppt.
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AgCl+2NH3-->
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Ag(NH3)2 + + Cl-
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What color is Ag2O?
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brown (ppt)
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2Ag+ +2OH- -->
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Ag2O+H2O
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What color is PbO?
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yellow
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What color is Pb3O4?
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red
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What color is PbO2?
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dark brown
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What color is PbSO4?
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white
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What color is PbS?
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Black
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What color is PbCrO4?
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yellow
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What color is Pb(OH)2?
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white
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What color is Hg?
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black
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How do you separate out Group I cations?
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Add HCl.
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How do you separate out Group II cations?
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mix them with thioacetamide (sulfur) in acidic conditions.
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What is the only group II sulfide that is not soluble in HNO3?
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HgS
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What color is CuS?
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black
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What color is Cu(OH)2?
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blue
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What color is Cu(NH3)4 2+?
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blue
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What color is Cu2[Fe(CN)6]?
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red-brown
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What color is Bi2S3?
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dark brown
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What color is BiOCl (from rxn with water)?
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white ppt
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What color is Bi(OH)3?
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white ppt
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What color is Bi metal?
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reddish black
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What color is HgS?
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Black
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What can dissolve HgS?
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Hot 6M NaOH and aqua regia.
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What color is HgO?
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yellow
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What color is HgI2?
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orange/red
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What color is CdS?
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Yellow
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What color is Cd(OH)2?
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white
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What color is SnS?
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brown
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What color is SnS2?
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yellow
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What color is Sb2S3?
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orange red
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What are the group one cations?
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Pb2+, Hg2 2+, Ag+
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How do you separate out the Group three cations?
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mix with sulfur in basic solution (forms sulfides or hydroxides)
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What color is FeS?
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black
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What color is Fe(OH)2?
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white, gelatinous
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What color is Fe(OH)3
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red-brown
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What color is KFe[Fe(CN)6]?
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dark blue
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What color is FeSCN2+?
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deep red
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What color is Al(OH)3?
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white gelatinous
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Aluminum+catechol violet=
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blue
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What color is K2Zn3[Fe(CN)6]2?
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light green ppt
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What color is MnS?
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pink
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What color is Mn(OH)2?
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white
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What color is MnO2?
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Brown
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What color is Mn04 and how can you produce it?
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purple (mix HNO3 and BiO3 with Mn2+ to get this)
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What color is Cr(OH)3?
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gelatinous green ppt
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What color is CrO5?
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blue
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What color is CoS?
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black
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What color is Co(SCN)4 2-?
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blue
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What color is NiS?
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black
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What color is Ni(OH)2?
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green
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What color is Ni(NH3)6 2+?
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blue
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What color is Ni(DMG)2?
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rose-red
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Fe belongs to what cation group?
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3
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Al3+ belongs to what cation group?
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3
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Zn3+ belongs to what cation group?
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3
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Mn2+ belongs to what cation group?
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3
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Cr3+ belongs to what cation group?
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3
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clever
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gescheit
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What color is Ni(OH)2?
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green
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What color is Ni(NH3)6 2+?
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blue
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What color is Ni(DMG)2?
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rose-red
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Fe belongs to what cation group?
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3
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Al3+ belongs to what cation group?
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3
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Zn3+ belongs to what cation group?
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3
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Mn2+ belongs to what cation group?
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3
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Cr3+ belongs to what cation group?
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3
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Co2+ belongs to what cation group?
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3
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Ni2+ belongs to what cation group?
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3
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Cu2+ belongs to what cation group?
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2
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Bi3+ belongs to what cation group?
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2
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Hg2+ belongs to what cation group?
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2
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Cd2+ belongs to what cation group?
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2
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Sn belongs to what cation group?
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2
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Sb belongs to what cation group?
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2
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Ag+ belongs to what cation group?
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1
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Pb2+ belongs to what cation group?
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1
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Hg2 2+ belongs to what cation group?
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1
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What buffer do you use to precipitate the group 3 cations?
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NH4+ / NH3 with thioacetimide
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What is the key difference between the group II and III cations?
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the group two cations are much LESS soluble as SULFIDES and can be ppt'd out in very ACIDIC sol. where the [S2-] is extremely low.
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What color is PbSO4?
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white
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What group II cations form soluble hydroxides?
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Sn or Sb
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Which of the group I cations is soluble in hot water?
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Pb2+
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Beer's Law
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A=ebc
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general nearnst equation
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E=E'-(RT/nF)lnQ
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standard nearnst equation
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E=E'-(.02569/n)lnQ
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