Paper 3-2019 Flashcards
(7 cards)
1
Q
Simplest ionic equation for
Na2S2O3 (aq) +2HCl(aq)—> 2NaCl(g)+SO2(g)+H2O(l)+S(s)
A
S2O32- +2H+—> SO2+S+H2O
2
Q
SO2 is pollutants. What property does it have to cause pollution in water?
A
Acidic
3
Q
H2SO4 forms HSO4- and H+
A
Normal reaction not equilibrium
4
Q
Making a Solution
A
Weigh solid on balance to 2 dp
Dissolve solid with distilled water
Transfer washing to 250cm3 volumetric flack
Mane u to 250cm3 mark and then shake to invert
5
Q
Why dissolving a sample increases PH
A
Eq shift to LHS to decrease number of [H+] and h+ion react with SO42/
6
Q
In std electrode potential set up
A
HCL- 1.00 mold-3
H2 gas- 100 kpa
FeCl2 and fe l3–> 1.00 moldm-3
7
Q
E0 cell for Fe3+/Fe2+ and STD E0
A
H2+2Fe3+—€2H++2Fe3+
