Chem Lab 1 Study Sheet Flashcards

1
Q

silver is ____ in aqueos solution

A

colorless

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2
Q

lead is ____ in aqueous solution

A

colorless

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3
Q

mercury is ____ in aqueous solution

A

colorless

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4
Q

Ag+ (aq) + Cl- (aq) —> ?

A

AgCl (white)

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5
Q

Pb^2(aq) + 2Cl-(aq) –> ?

A

PbCl2 (white)

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6
Q

Hg2^2+(aq) + 2Cl-(aq) —> ?

A

Hg2Cl2 (white)

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7
Q

immediate formation of a yellow percipitate of lead chromate confirms the presense of ____ original solution

A

Pb^2+

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8
Q

cation is an ____ complex ion Ag+

A

ammonia

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9
Q

silver chloride dissolves in aqueous ammonia forming a ___

A

soluble, colorless compound

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10
Q

when reaction produces black color ____ is present

A

mercury (Hg)

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11
Q

when HgCl2 comes in contact with aqueous ammonia undergoes an oxidation reduction reaction forming percipitates of ____

A

finely divided elemental mercury, Hg (black) and mercury (II) amide chloride, HgNH2Cl (white)

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12
Q

appearance of a dark gray to black percipitate confirms presence of ____

A

Hg2^2+ = mercury (II)

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13
Q

if silver ion present, centrate from procedure I-C contains _____

A

soluble ammonia complex of silver chloride

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14
Q

destroying this complex with nitric acid will bring the formation of ____ percipitate confirming presence of Ag+

A

silver chloride

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15
Q

appearance of a white percipitate confirms the presence of ____

A

Ag+

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16
Q

describe iron

A
  • Fe^2+
  • pale green in aqueous solution
  • Fe^3+
  • colorless in dilute HNO3
  • yellow in HCL
17
Q

describe chromium

A
  • Cr^2+
  • bright blue in aqueous solution
  • Cr^3+
  • dark blue violet in aqueous solution
18
Q

describe cobalt

A
  • CO^2+
  • red-pink in aqueous solution
19
Q

describe zinc

A
  • Zn^2+
  • colorless in aqueous solution
20
Q

yellow centrate suggests presence of ____

A

CrO4^2-

21
Q

formation of a dark blood red solution confirms presence of ____

A

Fe^3+

22
Q

rapid formation of yellow precipitate of lead chromate confirms presence of ____

A

chromium(III) in original solution