ANACHEM LAB: practice practical exam

di ko alam kung tama ba pinaggawa

• ammonia

• ammonium chloride

• ammonium sulfide

what does the solution contain where the Group III are precipitated

True

TRUE OR FALSE
Group III A and B contain five metallic sulfides altogether whose solubility products are too large to permit them to precipitate in Group II

Ferric Ion (Fe++)

What cation of group III formed a deep red solution

Deep red solution

What happens if you put KCNS solution in a precipitate with 3F HCL and 10D D. H2O

concentrated NH4OH (ammonium hydroxide)

what reagent will be used to make the precipitation of Group III cations distinctly alkaline

• aluminate

• zincate

• chromate

what are the water-soluble anions produced by excess Na2O2 (sodium peroxide) and KOH in group IIIA

False
There are only 2 hydroxides in Group II

TRUE OR FALSE

there are three hydroxides in Group II whose solubility products are smaller than the solubility products of their corresponding sulfides

KCNS solution (Potassium thiocyanate)

What confirmatory reagent is used for checking the presence of Ferric Ion

1F NH4NO3

what is the precipitating reagent for centrifugate 1 Group IIIA cations

Aluminum hydroxide

what does the precipitate 2 may contain in the analysis of group IIIA

• Aluminon

• 3F NH3 (hindi ako sure kung kasama ito)

what confirmatory reagent is used for checking the presence of aluminum ion

Red color solution

what happens if you add aluminon to an acidic solution with Al+++ ions

Red colored “lake” (red precipitate)

what happens if you add aluminon to a solution made alkaline

red precipitate

what is the precipitate in precipitate 2 confirming the presence of aluminum ion

aluminum ion (Al+++)

what is the cation when a red precipitate is formed in group IIIA

PbSO4 solution

what is the confirmatory reagent used in the formation of a yellow precipitate in group IIIa

PbSO4 solution

what is the confirmatory reagent used to check the presence of chromium ion

Chromium ion (Cr++)

what does the yellow precipitate in group IIIA indicates

Hydrogen peroxide

The addition of ____________ to an acid solution of a chromate produces a blue coloration due to the formation of CrO5

CrO5 (perchromate)

this compound unstable, decomposing rapidly with the evolution of oxygen, accompanied by fading of the color blue

• aluminum

• chromium

• iron

• cobalt

• nickel

• zinc

• manganese

what are the seven cations of group III

• iron

• cobalt

• nickel

• hydrated manganese dioxides

what hydroxides does the precipitate contain in procedure 2 group III

sodium bismuthate

what oxidizes the manganous ion when it is added to a cold solution of manganous ions containing dilute hydrochloric acid

sodium bismuthate

what reagent is used to check the presence of manganous ion

reddish-purple color in supernatant liquid

what would be the indication that the manganous ion is present

sodium bismuthate

what is the confirmatory reagent used in the first portion of analyzing group IIIB cations

manganese ion (Mn++)

what ion is to be analyzed in the first portion of analyzing group IIIB cations

manganese ion (Mn++)

what ion indicates reddish-purple color of supernatant liquid

• thioacetamide solution

• 3F HAc (hindi ko ulit sure kung tama)

what is the confirmatory reagent used to check the presence of zinc ion

white / milky precipitate

what is the precipitate indicating the presence of the zinc ion

zinc ion (Zn++)

what ion does white precipitate indicate in analyzing group IIIB cation

True

TRUE OR FALSE
an intense blue-colored complex is formed with ammonium thiocyanate at the interface of the two liquids Co(CNS)4

False

the precipitate may darken because of the presence of small amount ferrous and cobaltous ions which precipitate as FeS and CoS or lead ions which may escape from Group II

TRUE OR FALSE
In the test for zinc ions, after adding the thioacetamide solution, the precipitate will remain white because of the presence of ferrous and cobaltous ions

• KNO3 solution

• 3F HAc (hindi ulit ako sure kung kasama yan)

what is the confirmatory reagent used in analyzing the third portion in group IIIB and produced a yellow precipitate

cobalt ion (Co++)

what cation of group IIIB is present when a yellow precipitate is formed

yellow precipitate

what is the precipitate of the third portion indicating the presence of cobalt ion

Ammonium thiocyanate

what produces an intense blue-colored complex at the interface of the two liquids Co(CNS)4

Dimethylglyoxime

it is an organic compound that reacts with Ni+++ producing a red precipitate.

• solid NaF

• 3F NH3

• dimethylglyoxime

what are the reagents used in the test for nickel ion

C4H8O2N2

what is the chemical formula for dimethylglyoxime

red precipitate

what precipitate indicates the presence of nickel ion

Nickel ion (Ni++)

what ion is present in the formation of red precipitate in the fourth portion

Nickel ion (Ni++)

what ion indicates red precipitate when dimethylglyoxime is added

• Calcium oxalate

• Calcium fluoride

In the separation of group I anion into two, what 2 anions are insoluble in dilute acetic acid.

• sulfite

• arsenite

• arsenate

• phosphate

what are the anions of the group I are considered soluble to dilute acetic acid

True

TRUE OR FALSE

the soluble subgroup of group I anions must be tested immediately because it may oxidize into sulfate and arsenate by atmospheric oxygen

• 3F HCl

• H2O

• KClO3

what are the reagents used in the test for carbonate ion

vigorous effervescence

what the visible reaction indicating the presence of carbonate ion

carbonates and hydroxides of heavy metal ions

after centrifuging the solution in procedure 2 in the analysis of group I anions, what does the precipitate contain that it is supposed to be discarded?

anions in the form of soluble sodium salts

after centrifuging the solution in procedure 2 in the analysis of group I anions, what does the centrifuge contain to be analyzed in procedure 3

1.5 F Na2CO3

what reagent is used in the procedure 2 analysis of group I anions that forms soluble sodium salts

2F Ca(Ac)2

what is the precipitating reagent used in the procedure 3

Groupings II-V

after centrifuging the solution in procedure 3, what does the centrifugate contain reserved for procedure 7

insoluble calcium salts of carbonate, sulfite, arsenite, arsenate, phosphate, oxalate, or fluoride ions

after centrifuging the solution in procedure 3, what does the residue remain

3F HAc

what reagent is used to separate group I anions into two subgroups

• sulfite

• arsenite

• arsenate

• phosphate

what group I anions contain in centrifugate in procedure 4

• CaC2O4

• CaF2

what group I anions contain in the residue in procedure 4

sulfite

white precipitate (group ia anions)

• concentrated HCl

• Ba(Ac)2

• H2O2

what reagent is used to check the presence of sulfite ion

H2O2

what confirmatory reagent is used to clear the centrifugate in the first portion (group ia anion)

• arsenite

• phosphate

yellow precipitate (group ia anion)

thioacetamide

what confirmatory reagent is used to check the presence of arsenite ion, producing a yellow precipitate

KI crystals (potassium iodide?)

what confirmatory reagent is used to produce a brown solution indicating the presence of arsenate ions

arsenate ions

what anion is present if the solution turns brown

pink colored layer

adding CCl4 to an unknown solution produces what visible result

arsenate ion

what anions is present if there is a pink colored layer in an unknown solution after adding CCl4

• concentrated HNO3

• solid tartaric acid

• ammonium molybdate solution

what are the reagent used for the test of phosphate ion

phosphate ion

what ion indicates the formation of yellow precipitate in the test for group I anions

yellow precipitate

what would be formed after adding ammonium molybdate solution to the fourth portion of group ia anion

Disappearance of pink color

after adding 0.01F KMnO4 solution, what should be observed indicating the presence of oxalate ions

0.01F KMnO4 solution

what confirmatory reagent is used to check the presence of oxalate ions

Etching of glass

what should be observed indicating the presence of fluoride ion

False

concentrated h2so4 was used

True or False
1.5F H2SO4 will be dropped upon dry residue on the watch glass and continue to heat over water bath for 5 minute

chlorides that are relatively insoluble in dilute acids

what does group 1 cations composed of?

GROUP II-V

what does the centrifugate contain when it was removed in precipitating group I cations

• PbCl2

• AgCl

• Hg2Cl2

GROUP 1 CATIONS:

white precipitate obtained in procedure 1 may be ____, _____, and _____

Lead (Pb++)

GROUP 1 CATIONS

centrifugate 1 may contain what ion

1F K2CrO4 (Potassium chromate)

GROUP 1 CATIONS
what is the reagent used to precipitate it yellow and confirm the presence of Lead ion

• AgCl

• Hg2Cl2

GROUP 1 CATIONS

what ions might be present in the residue 1

Mercurous Ion

GROUP 1 CATIONS
blackening of the residue indicates the presence of what ion?

Silver ion

GROUP 1 CATIONS

white presence confirms the presence of what ion?

white

GROUP 1 CATIONS

what is the color of the precipitate that confirms the presence of silver ion

3F HNO3

GROUP 1 CATIONS

what is the precipitating reagent used to confirm the presence of silver ion

white or gray

GROUP 1 CATIONS

what color of precipitate confirms the presence of mercurous ion

SnCl2

GROUP 1 CATIONS

what is the precipitating reagent used to confirm the presence of mercurous ion

True

TRUE OR FALSE

the separation of a group of cations is determined by the relative solubility

False

TRUE OR FALSE

the chlorides of group 1 cations are soluble

GROUP II Cations

this group 2 is composed of eight cations which precipitate as sulfides from a solution of 0.3 F in respect to hydronium ions