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In the process of pickling, rust is removed from newly
Chapter 4, Problem 98P(choose chapter or problem)
In the process of pickling, rust is removed from newly produced steel by washing the steel in hydrochloric acid:
(1) \(6 \mathrm{HCl}(\mathrm{aq})+\mathrm{Fe}_{2} \mathrm{O}_{3}(\mathrm{~s}) \rightarrow 2 \mathrm{FeCl}_{3}(\mathrm{aq})+3 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})\)
During the process, some iron is lost as well:
(2) \(2 \mathrm{HCl}(\mathrm{aq})+\mathrm{Fe}(\mathrm{s}) \rightarrow \mathrm{FeCl}_{2}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{~g})\)
Which reaction, if either, is a redox process?
If reaction 2 did not occur and all the HCl were used, how many grams of \(\mathrm{Fe}_{2} \mathrm{O}_{3}\) could be removed and \(\mathrm{FeCl}_{3}\) produced in a \(2.50 \times 10^{3}-L\) bath of \(3.00 M\) HCl?
If reaction 1 did not occur and all the HCl were used, how many grams of Fe could be lost and \(\mathrm{FeCl}_{2}\) produced in a \(2.50 \times 10^{3}-L\) bath of \(3.00 M\) HCl?
If 0.280 g of Fe is lost per gram of \(\mathrm{Fe}_{2} \mathrm{O}_{3}\) removed, what is the mass ratio of \(\mathrm{FeCl}_{2}\) to \(\mathrm{FeCl}_{3}\)?
Equation Transcription:
6HCl(aq) + Fe2O3(s) 2FeCl3(aq) + 3H2O(l)
2HCl(aq) + Fe(s) FeCl2(aq) + H2(g)
Fe2O3
FeCl3
2.50 x 103-L
FeCl2
Text Transcription:
6HCl(aq) + Fe_2O_3(s) rightarrow 2FeCl_3(aq) + 3H_2O(l)
2HCl(aq) + Fe(s) rightarrow FeCl_2(aq) + H_2(g)
Fe_2O_3
FeCl_3
2.50 x 10^3-L
3.00 M
FeCl_2
0.280 g
Questions & Answers
QUESTION:
In the process of pickling, rust is removed from newly produced steel by washing the steel in hydrochloric acid:
(1) \(6 \mathrm{HCl}(\mathrm{aq})+\mathrm{Fe}_{2} \mathrm{O}_{3}(\mathrm{~s}) \rightarrow 2 \mathrm{FeCl}_{3}(\mathrm{aq})+3 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})\)
During the process, some iron is lost as well:
(2) \(2 \mathrm{HCl}(\mathrm{aq})+\mathrm{Fe}(\mathrm{s}) \rightarrow \mathrm{FeCl}_{2}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{~g})\)
Which reaction, if either, is a redox process?
If reaction 2 did not occur and all the HCl were used, how many grams of \(\mathrm{Fe}_{2} \mathrm{O}_{3}\) could be removed and \(\mathrm{FeCl}_{3}\) produced in a \(2.50 \times 10^{3}-L\) bath of \(3.00 M\) HCl?
If reaction 1 did not occur and all the HCl were used, how many grams of Fe could be lost and \(\mathrm{FeCl}_{2}\) produced in a \(2.50 \times 10^{3}-L\) bath of \(3.00 M\) HCl?
If 0.280 g of Fe is lost per gram of \(\mathrm{Fe}_{2} \mathrm{O}_{3}\) removed, what is the mass ratio of \(\mathrm{FeCl}_{2}\) to \(\mathrm{FeCl}_{3}\)?
Equation Transcription:
6HCl(aq) + Fe2O3(s) 2FeCl3(aq) + 3H2O(l)
2HCl(aq) + Fe(s) FeCl2(aq) + H2(g)
Fe2O3
FeCl3
2.50 x 103-L
FeCl2
Text Transcription:
6HCl(aq) + Fe_2O_3(s) rightarrow 2FeCl_3(aq) + 3H_2O(l)
2HCl(aq) + Fe(s) rightarrow FeCl_2(aq) + H_2(g)
Fe_2O_3
FeCl_3
2.50 x 10^3-L
3.00 M
FeCl_2
0.280 g
ANSWER:
Solution 98P:
Step 1
(a) Here we have to find out which reaction is a redox process.
The two given reaction of pickling process is ,
1. 6HCl (aq) + Fe2O3 (s) → 2FeCl3 + 3H2O
2.2HCl (aq) + Fe (s)→ FeCl2 (aq) + H2 (g)
Among the two given reactions, the 2nd reaction is a redox process because in this reaction the oxidation state of iron changes from 0 to +2 (oxidizes) whereas the oxidation number of hydrogen changes from +1 to 0 (reduces).