Chemistry, 18.02.2020 22:36, liddopiink1

Gravimetric determination of Iron as Fe2O3

A sample containg iron can be analyzed by precipitation of the hydrous oxide from basic solution, followed by ignition to Fe2O3:

Fe3+ + (2+x)H2O > FeOOH* xH2O(s) + 3H+

FeOOH * xH2O > Fe2O3 (s)

weigh three samples of unknown containg enough Fe to produce ~0.3g of Fe2O3

In my experiment,

unknow sample weight: 0.75g 0.80 0.70

Fe2O3 collected from unknow: 0.05g 0.04 g 0.03g

how do I calculate (1)% Fe in unknown sample

(2) average % Fe

(3)standard deviation

(4) relative standard deviation

determine (1) % Fe in unknown sample

(2)average % Fe

(3)standard deviation

(4)relative standard deviation

For gravimetric determination of Iron as Fe2O3, how do I calculate?

weighed sample of unknown containing Fe to produce ~0.3g of Fe2O3 (~0.6 - 1 g of unkonwn)

I got 0.75g from unknow sample.

I got 0.05g from Fe2O3 collected from unknow.

Answers: 3

Show answers

Other questions on the subject: Chemistry

Chemistry, 22.06.2019 14:30, emilymartinez75

Need ! asap will mark 10 pts using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. explain your answers

Answers: 1

continue

Chemistry, 22.06.2019 16:30, blognero

An atom with 7 protons, 6 neutrons, and 7 electrons has an atomic mass of amu. (enter a whole number.) numerical answers expected! answer for blank 1:

Answers: 3

continue

Chemistry, 22.06.2019 23:30, adamgala3885

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth

Answers: 1

continue

Chemistry, 23.06.2019 02:00, FailingstudentXD

Calculate the molarity of each aqueous solution: a. 78.0 ml of 0.240 m naoh diluted to 0.250 l with water b. 38.5 ml of 1.2 m hno3 diluted to 0.130 l with water

Answers: 1

continue

Do you know the correct answer?

Gravimetric determination of Iron as Fe2O3

A sample containg iron can be analyzed by pre...