Chem 107 Quantitative Final

50 terms by csloan2 

Create a new folder

Advertisement Upgrade to remove ads

Colors and other important information

PbI_2
Color = yellow
exp 1

Lead Iodide

Ag_2CrO_4
Color = red
exp 1

Silver Cromate

Ag_2O
color=brown
exp 1

silver oxide

Ag(S_2O_3)_2^3-
color = colorless
exp 1

Silver sulfite

PbCrO_4
color=pale yellow
exp 1

lead cromate

Hg_2Cl_2
color=white
exp. 1

mercury chloride

Fe(OH)_3
color=rust
exp 2

iron oxide

Al(OH)_4^-
color=colorless
exp 2

aluminum oxide

ZnS
color=white
exp 2

zinc sulfide

Zn(OH)_2
color=white
exp 2

zinc oxide

Fe(SCN)^2+
color=dark-red brown
exp 2

iron thiocyanate

Zn(HH_3)_4^2+
color=colorless
exp 2

zinc ammonia

BaCrO_4
color=yellow
exp 3

barium chromate

CaC_2O_4
color=white
exp 3

calcium oxalate

Ba^2+
color=colorless
exp 3

Barium

Ca(OH)_2
color=white
exp 3

calcium oxide

CaCO_3
color=white
exp 3

calcium carbonate

BaC_2O_4
color=white
exp 3

barium oxalate

Ag_2S
color=black
exp 4

silver sulfide

BaCO_3
color=white
exp 4

barium carbonate

Ag_3PO_4
color=yellow
exp 4

silver phosphate

Br_2 (aq)
color=red-brown
exp 4

bromine

BaSO_3
color=white
exp 4

barium sulfite

Fe(NO)^2+
color=brown
exp 4

iron nitrate

Mercury, Hg2
exp 1

You have one and only one present between the choice of ions of Ag+, Pb2+, and Hg2+. you add HCL and you have a precipitate, you then discard the supernatant and add H2O and then centrifuge. Separating the supernatant and the ppt. you add NH3 to the ppt. and get a gray/black precipitate. which ion is present?

mercury, Hg2
exp 1

you can have more than none, one or multiple ions present. from a choice of Ag+, Pb2+, and Hg2+. you add HCl and you have a precipitate, discarding the supernatant and then cleaning the ppt. with H2O you then separate the ppt from the supernatant, preserving both. you then then add potassium chromate to the supernatant and a yellow precipitate forms. you then add nitric acid to the ppt. and a white precipitate forms. which ion is not present in the unknown?

Iron, Fe
exp 2

you can have one and only one ion present. form a choice of Fe, Al, and Zn. you add NH3 to the solution and a precipitate forms. separating the the supernatant from the ppt and preserving both you add water and NaOH to the ppt. you then centrifuge this and add HCl and water and then wash it out leaving the ppt behind. then adding KSCN to the ppt creates a red solution which ion is present?

zinc Zn, and Aluminum Al
exp 2

You can have more than one or none of the following ions. Fe, Al, and Zn. You add NH3 to the solution and a ppt forms. after separating the supernatant from the ppt you do the aluminum ion test. the appearance of a pink precipitate in the aluminum part appears. you then add (NH4)S to the original supernatant and a white precipitate forms. which ion(s) are present?

barium Ba,
exp 3

you can have one and only one ion. choosing from Ba, Ca, NH4, and K+. you first add ammonium carbonate to the solution and a ppt forms. separating and preserving the supernatant and ppt you add acetic acid and ammonium acetate to the ppt. and centrifuge. Adding potassium cromate to the solution you then centrifuge again and separate the ppt and solution preserving both. washing the ppt with HCl and then adding soduim sulfate and centrifuging you see the formation of a white ppt, what ion is present in the solution?

ammonium NH4, and Calcium Ca
exp 3

you can have more than one or none or one. choosing from Ba, Ca, NH4, and K+. you first add ammonium carbonate to the solution and a ppt forms. separating and preserving the supernatant and ppt you add acetic acid and ammonium acetate to the ppt. and centrifuge. Adding potassium cromate to the solution you then centrifuge again and separate the ppt and solution preserving both. you then add NH3 to the supernatant and then centrifuge. discard the supernatant and keeping the ppt you then wash the ppt with HCl following this you add sodium sulfate and no precipitation occurs. you also test a fresh solution of the unknown by adding 3 drops of NaOH and placing a pH paper over top. the formation of a darkened ring appears on the paper. what ions are present?

chloride ion, Cl
exp 4

you can have one and only one ion present. choosing from S_2, SO_3, SO_4, CO_3, NO_3, Br, I, Cl, and PO_4. after adding HNO_3 and then AgNO_3 and discarding the supernatant and preserving the ppt you are add more HNO_3 and then NH_3 and then HNO_3 and a white precipitate forms. Which ion is present?

sulfide ion S_2, phosphate ion PO_4, Carbonate CO_3, and sulfite ion SO_3.
exp 4

you can have one, more than one, or none.
choosing from S_2, SO_3, SO_4, CO_3, NO_3, Br, I, Cl, and PO_4. after adding HNO_3 and AgNO_3 to part of the unknown a black precipitate forms. to a fresh solution of the unknown you add NH_3 and BaCl_2. a ppt forms you save both the supernatant and ppt. to the ppt you add HCl and the formation of bubbles is noticed. to the same precipitate you add H2O and more HCl and centrifuge. you then save the supernatant and ppt and divide the supernatant into two tubes. after adding bromine water to the first tube saved with supernatant you get a white ppt. after adding a molybate solution to the second supernatant you get a yellow ppt. which ions are present?

add HNO_3 and AgNO_3 if the solution turns to a black ppt you got sulfide.
exp 4

what is the test for sulfide ion

add NH_3 and BaCl_2. then add HCl and a bunch of water and mix. then you take the supernatant of this and add bromine water. the formation of a white ppt indicates the presence of sulfite.
exp 4

what is the test for sulfite ion

add NH_3 and BaCl_2. then add HCl and a bunch of water and mix. if barium is present it will not dissolve. and it will be a white ppt. then add a few drops to the HCl ppt after decanting the supernatant if the ppt is still there it confirms sulfate ion presence.
exp 4

what is the test for the sulfate ion

super easy... add NH_3 and BaCl_2 then take the ppt and slowly add HCl if there are bubbles that form you got carbonate
exp 4

what is the test for the carbonate ion

add the Molybate solution to the solution the presence of a yellow ppt indicates you got phosphate. oh and you also need to add HNO_3 that will show you that there is phosphate
exp 4

what is the test for the phosphate ion

take some HCl and saturated chlorine water. then if color forms you got either bromide or iodide. then add a bunch of hexane. if you get a purple hexane then its iodide and if you get a yellow/ brown hexane then its bromide.
exp 4

what is the test for the bromide and iodide ions

add some HNO_3 to a solution then add some AgNO_3. if a ppt forms keep going. to the ppt add HNO_3 then add some water and NH_3. then agitate the whole mixture. then make the think acidic with HNO_3. the formation of a white ppt will indicate Chlorine.
exp 4

what is the test for the chloride ion

pretty much throw in some H_2SO_4 and then add some saturated Fe2+. you get a brown ring between the two phases and ya got nitrate.
exp 4

what is the test for the nitrate ion

just do the potassium flame test with some of the evaporated water and you are good to go. if its purple you got K+
exp 3

what is the test for the potassium ion

just add 3 drops of NaOH to the unknown then put a pH paper over top, if you get a ring ya got ammonium.
exp 3

what is the test for the ammonium ion

throw in some ammonium carbonate first, (actually you do that with all exp. 3 stuff except the NH4 test. ) then you add some acetic acid and some ammonium acetate. then throw in some potassium oxalate and if you get a ppt you got calcium (most likely).
exp 3

what is the test for the calcium ion

throw in some ammonium carbonate first, (actually you do that with all exp. 3 stuff except the NH4 test. ) then you add some acetic acid and some ammonium acetate. then throw in some potassium chromate and you got barium.
exp 3

what is the test for the barium ion

throw in some NH_3 into the unknown then add NaOH and water to clean out the ppt a little then wash it again with HCl and water then add KSCN and if you get a red solution you got iron ion.
exp 2

what is the test for the iron ion

do the aluminum ion test. you first add NH_3 then you take the supernatant then you add HCl and NH_3 to both tubes of the non-aluminon and the aluminon. then if you get a white and pink ppt respectively you got aluminum.
exp 2

what is the test for the aluminum ion

easy....just add some NH_3 to the unknown. take the supernatant and add some (NH4)_2S and if you get a white ppt you got zinc.
exp 2

what is the test for the zinc ion

add some HCl and keep the ppt. wash out with water. add some HNO_3 and if you get a white ppt you got silver.
exp 1

what is the test for the silver ion

add some HCl and keep the ppt. wash out with water. add some NH_3 and if you get a gray/black ppt you got mercury.
exp 1

what is the test for the mercury ion

add some HCl and keep the ppt. wash out with water and take the supernatant. add some potassium chromate and if you get a yellow ppt you got lead.
exp. 1

what is the test for the lead ion

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set