Name QUESTIONS 1. Explain why an excess of Fel\" is necessary for the NO, test.
ID: 580376 • Letter: N
Question
Name QUESTIONS 1. Explain why an excess of Fel" is necessary for the NO, test. 2. Explain fully the purpose of ammonia in the Group I anions general test Explain how one can be certain whether an unknown contains the I ion or the Br ion. Include appropriate equation s). 3. Tell how you could distinguish chemically berween the following pairs of sub- stances (in separate test tubes) in one or two steps. In each case, tell what you would observe. Include equations for reactions occurting. 4. a) NaCI and NaNO, solutionsExplanation / Answer
Q1
NO3- test will not have any effect on Fe2+ since it is not soluble/will see no visible change
Q2
Ammonia test --> helps increase pH
Oh- is present, so Ag+, Pb+2, Hg+2 will precipitate as AgOH+ Pb(OH)2, Hg2(OH)2
Q3
I- color --> yellowish
Br- ion = brown
therefore, if solution is yellow = iodine is present
if solutino is born then brominei spresent
Q4
NaCl --> Cl- is present, addition of Fluorine gas, will follow Cl2(g) production
NaNO3 -->Apply Copper turning test
Cu + 4HNO3 Cu(NO3)2 + 2NO2(g) +2H2O
expect "blue Color", increase in pH, and NO2(g) formation (bubbles)
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