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Chem Lab > Group 1 anions > Flashcards

Group 1 anions Flashcards

1
Q

Effervescence

A

escape of gas from an aqueous solution; foaming or fizzing that results from that release

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2
Q

Reagents for Day 1

A

Dilute HCl and KClO3

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3
Q

First day second procedure reagents

A

Sodium Carbonate Solution

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4
Q

First Day Third Procedure Precipitating agent

A

Calcium Acetate

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5
Q

CO3-2 Confirmatory Reagent

A

KClO3

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6
Q

C2O4-2 Confirmatory Reagent

A

Potassium Permanganate

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7
Q

SO3-2 Confirmatory Reagent

A

H2O2

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8
Q

AsO2-1 Confirmatory Reagent

A

Thioacetamide

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9
Q

AsO4-3 Confirmatory Reagent

A

KI

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10
Q

PO4 3- Confirmatory Reagent

A

Ammonium Molybdate

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11
Q

F- Confirmatory Reagent

A

concentrated H2SO4

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12
Q

Sulfite confirmed as

A

BaSO4

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13
Q

Arsenite confirmed as

A

As2S3

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14
Q

Carbonate confirmed as

A

CO2

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15
Q

Oxalate confirmed as

A

Mn+2

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16
Q

Phosphate confirmed as

A

ammonium phosphomolybdate [(NH4)3PO4∙12MoO3]

17
Q

Fluoride confirmed as

A

SiF4

18
Q

Carbonate Chemical evidence

A

vigorous effervescence

19
Q

Oxalate chemical evidence

A

pink to colorless

20
Q

Sulfite chemical evidence

A

white precipitate

21
Q

Arsenite chemical evidence

A

immediate yellow solution

22
Q

Phosphate chemical evidence

A

voluminous yellow precipitate

23
Q

Fluoride chemical evidence

A

etching of watch glass

24
Q

Etching produced by Fluoride ion

A

HF + SiO2 (glass) -> SiF4 + H2O

25
Q

Test for Arsenite

A

2H3AsO3 + 3H2S -> As2S3 + 6H2O

26
Q

Test for Sulfite ion

A

H2SO3 +H2O2 + H2O <-> SO4- + 2H3O+
SO4- + Ba++ <-> BaSO4

27
Q

GROUP 1 includes ions whose calcium salts are _____ in _____ solution.

A

insoluble, slightly basic

28
Q

precipitating agent for group 1

A

calcium acetate ion

29
Q

Carbonate ions should be analyzed first because

A

carbonate reagent is always use in the whole analysis of anions thus creating false positive result

Chem Lab (1 decks)

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