Academic Integrity: tutoring, explanations, and feedback — we don’t complete graded work or submit on a student’s behalf.

1. A lab assistant organizing a cabinet used to store general reagents used in l

ID: 1027067 • Letter: 1

Question

1. A lab assistant organizing a cabinet used to store general reagents used in laboratory spot tests, discovered six unlabeled bottles containing two clear liquids, three containing clear, light green/blue-green liquids and the last a clear blue solution. From the inventory list of the cabinet, the assistant determined the possible identities as sodium hydroxide, lead(II) nitrate, nickel(II) nitrate, nickel(II) sulfate, nickeN) iodide, and one of three copper compounds- copper() chloride, copper(Il) nitrate, or copper(I) sulfate. The lab assistant eliminated the copper(Il) sulfate as a possible unknown by using the barium chloride test for anions. Confirmation of the identity of all the unlabeled bottles was required, so the assistant performed a simple set of reaction in order to do a comparative analysis of the unknown results with results for known solutions. Labeling the unknown solution bottles as unknowns A-F, the following results were obtained when mixing small volumes of the reaction pairs: E, clear Light blue-green green ppt Light blue-green ereen ppt Light blue-green ight blue-green Light blue-green Solution: F, clear D, blue C, green B, green Light blue-green solution; white ppt Light blue-green solution no ppt Light blue-green Light blue-green solution no ppt A, green solution; no ppt Light blue-green solution no ppt Light blue-green solution o ppt Light blue-green solution no ppt B, green C, green solution; yellow ppt Light blue white ppt Clear solution; green pptwhite/cream ppt Light blue-green D, blue blue-green ppt E, clear white ppt Complete the summary table below: Solution: Number of White Precipitates Number and Colors of non-white Precipitates Unknown A Unknown B Unknown C Unknown D Unknown E Unknown

Explanation / Answer

Solution: Number of white precipitates Number and Colours of non-white precipitates Unknown A one (with unknown F) one (green with unknown E) Unknown B Zero one (green with unknown E) Unknown C One (with unknown D) Two ( green with unknown E, yellow with known F) Unknown D Two ( one with unknown D and other with unknown F) One (blue-green with unknown E) Unknown E One (with unknown F) Four (green with unknowns A,B and C, blue green with unknown D) Unknown F Three (with unknowns A, D and E) One ( yellow with unknown C)

Related Questions

1. A highway has an optional toll lane that drivers may take to reduce the time
Question #3116641
1. A hiker sees a lightning flash and 15 s later hears the sound of the thunder.
Question #1381324
1. A hiker sees a lightning flash and 15 s later hears the sound of the thunder.
Question #1381326
1. A hippo is dozing under water with only its small nostrils sticking out. It h
Question #1341242
1. A hippo is dozing under water with only its small nostrils sticking out. It h
Question #1361458
1. A histology student accidently gets two unlabeled prepared slides mixed up. O
Question #3475986
1. A hockey player passes the puck to a teammate who is not paying attention. Th
Question #1497778
1. A homeowner asks an energy consultant to find the heat loss from his home. On
Question #1978350

Navigate

Previous
1. A knife thrower throws a knife toward a 300-g target that is sliding in her d
Next
1. A lab tech adds 0.20 mol of NaF to 1.00 mL OF 0.35 M cadmium nitrate, Cd(NO3)

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.