๐Ÿท๏ธ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION โ†’
Log in
Chemistry
1
answer
0
watching
647
views
23 Nov 2019

A 0.3284g sample of brass ( containing lead, zinc, copper, andtin) was dissolved in nitric acid. The sparingly solubleSnO2. 4H2O was removed byfiltration, and the combined filtrate and washings were thendiluted to 500.0mL. A 10.00mL aliquot was suitably buffered;titration of the lead, zinc, and copper in this aliquot required37.56mL of 0.002500M EDTA. The copper in a 25.00mL aliquot wasmasked with thiosulfate; the lead and zinc were then titrated with27.67mL of the EDTA solution. Cyanide ion was used to mask thecopper and zinc in a 100mL aliquot; 10.80mL of the EDTA solutionwas needed to titrate the lead ion. Determine the composition ofthe brass sample; evaluate the % of tin by difference.

All I can say is huh? I need to see steps please.

Answer in the back of book is 8.518% Pb, 24.86% Zn, 64.08% Cu,and 2.54% Sn.

I do not get anywhere near these answers. What am I doingwrong??

Watch
1
answer
0
watching
647
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Collen Von
Collen VonLv2
19 Jul 2019

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share
discord banner image
Join us on Discord
Chemistry Study Group
Join now

Related textbook solutions

Basic Chemistry
5 Edition,
Timberlake
ISBN: 9780134138046
Principles of Chemistry Molecular Approach
4th Edition,
Tro
ISBN: 9780134112831
Chemistry: Structure and Properties
2nd Edition,
Tro
ISBN: 9780134293936
Principles of Chemistry Molecular Approach
3rd Edition, 2014
Tro
ISBN: 9780321971944
Chemistry: A Molecular Approach
3rd Edition,
Tro
ISBN: 9780321809247
Chemistry: A Molecular Approach
5th Edition,
Tro
ISBN: 9780134874371
Principles of Chemistry: A Molecular Approach
4th Edition,
Tro
ISBN: 9780134895741
Chemistry: The Central Science
14th Edition, 2017
Brown
ISBN: 9780134414232

Related questions

A 0.4423 g sample of pewter, containing tin, lead, copper, and zinc, was dissolved in acid. Tin was precipitated as SnO2ร‚ยท4H2O and removed by filtration. The resulting filtrate and washings were diluted to a total volume of 200.0 mL. A 15.00 mL aliquot of this solution was buffered, and titration of the lead, copper, and zinc in solution required 35.87 mL of 0.001481 M EDTA. Thiosulfate was used to mask the copper in a second 20.00 mL aliquot. Titration of the lead and zinc in this aliquot required 33.95 mL of the EDTA solution. Finally, cyanide was used to mask the copper and the zinc in a third 25.00 mL aliquot. Titration of the lead in this aliquot required 25.03 mL of the EDTA solution. Determine the percent composition by mass of each metal in the pewter sample

A 0.4485 g sample of pewter, containing tin, lead, copper, and zinc, was dissolved in acid. Tin was precipitated as SnO2ร‚ยท4H2O and removed by filtration. The resulting filtrate and washings were diluted to a total volume of 250.0 mL. A 15.00 mL aliquot of this solution was buffered, and titration of the lead, copper, and zinc in solution required 34.07 mL of 0.001534 M EDTA. Thiosulfate was used to mask the copper in a second 20.00 mL aliquot. Titration of the lead and zinc in this aliquot required 34.56 mL of the EDTA solution. Finally, cyanide was used to mask the copper and the zinc in a third 25.00 mL aliquot. Titration of the lead in this aliquot required 25.76 mL of the EDTA solution. Determine the percent composition by mass of each metal in the pewter sample.

Cu%=

Zn%=

Pb%=

Sn%=

A 0.4809 g sample of pewter, containing tin, lead, copper, and zinc, was dissolved in acid. Tin was precipitated as SnO2ร‚ยท4H2O and removed by filtration. The resulting filtrate and washings were diluted to a total volume of 200.0 mL. A 20.00 mL aliquot of this solution was buffered, and titration of the lead, copper, and zinc in solution required 34.79 mL of 0.001492 M EDTA. Thiosulfate was used to mask the copper in a second 25.00 mL aliquot. Titration of the lead and zinc in this aliquot required 34.57 mL of the EDTA solution. Finally, cyanide was used to mask the copper and the zinc in a third 30.00 mL aliquot. Titration of the lead in this aliquot required 26.76 mL of the EDTA solution. Determine the percent composition by mass of each metal in the pewter sample.

a) %Cu?

b)%Zn?

c)%Pb?

d)%Sn?

Weekly leaderboard

Home
Homework Help 3,900,000
Chemistry 830,000
Start filling in the gaps now
Log in