Group 1 anions

Question 1

Effervescence

Answer 1

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

Question 2

Reagents for Day 1

Answer 2

Dilute HCl and KClO3

Question 3

First day second procedure reagents

Answer 3

Sodium Carbonate Solution

Question 4

First Day Third Procedure Precipitating agent

Answer 4

Calcium Acetate

Question 5

CO3-2 Confirmatory Reagent

Answer 5

KClO3

Question 6

C2O4-2 Confirmatory Reagent

Answer 6

Potassium Permanganate

Question 7

SO3-2 Confirmatory Reagent

Answer 7

H2O2

Question 8

AsO2-1 Confirmatory Reagent

Answer 8

Thioacetamide

Question 9

AsO4-3 Confirmatory Reagent

Answer 9

KI

Question 10

PO4 3- Confirmatory Reagent

Answer 10

Ammonium Molybdate

Question 11

F- Confirmatory Reagent

Answer 11

concentrated H2SO4

Question 12

Sulfite confirmed as

Answer 12

BaSO4

Question 13

Arsenite confirmed as

Answer 13

As2S3

Question 14

Carbonate confirmed as

Answer 14

CO2

Question 15

Oxalate confirmed as

Answer 15

Mn+2

Question 16

Phosphate confirmed as

Answer 16

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

Question 17

Fluoride confirmed as

Answer 17

SiF4

Question 18

Carbonate Chemical evidence

Answer 18

vigorous effervescence

Question 19

Oxalate chemical evidence

Answer 19

pink to colorless

Question 20

Sulfite chemical evidence

Answer 20

white precipitate

Question 21

Arsenite chemical evidence

Answer 21

immediate yellow solution

Question 22

Phosphate chemical evidence

Answer 22

voluminous yellow precipitate

Question 23

Fluoride chemical evidence

Answer 23

etching of watch glass

Question 24

Etching produced by Fluoride ion

Answer 24

HF + SiO2 (glass) -> SiF4 + H2O

Question 25

Test for Arsenite

Answer 25

2H3AsO3 + 3H2S -> As2S3 + 6H2O

Question 26

Test for Sulfite ion

Answer 26

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

Question 27

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

Answer 27

insoluble, slightly basic

Question 28

precipitating agent for group 1

Answer 28

calcium acetate ion

Question 29

Carbonate ions should be analyzed first because

Answer 29

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