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When KzCr207(aq) [orange] is acidiﬁed with
. - . . H 0 d eact , . -
solution turns green, indicating formation of Cris aﬁ: 31:1,]; are formed 1nd1cat1ng
. + + 02(g)
The redax reaction before step 0 is: [gel-207 + H2504(aq) + H202(aCI) “'4 C13
Balancing Redox Equations by the Half—Reaction Method
Step 0 Choose the skeletal equation. Eliminate spectator ions such as Na+, K+. Eliminate 1 H+ and
as sulfate, nitrate, and Chloride if they are not involved in the redox process. Leave out .
OH’. Be ca