The arsenic in a 1.273-g sample of a pesticide was converted to H3 AsO4 by suitable treatment. The acid was then neutralized, and 42.00 mL of 0.05871 M AgNO3 was added to precipitate the arsenic quantitatively as Ag, AsO4. The excess Ag* in the filtrate and in the washings from the precipitate was titrated with 9.58 mL of 0.1000 M KSCN, and the reaction was Ag+ + SCN → AgSCN(s) Find the percentage of As2 O3 in the sample. Percentage of As2 O3

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Chapter5: Chemical Reactions
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This was what was done before with the values in order of the prompt: 1.208 g, 44.00 mL, 0.05854 M, 9.69 mL, 0.1000 M KSCN. It was wrong, but this is a different set.

Step 1
moleaf As =} mole af Asz O3
moleaf As adom
= mole af Hq As O=molesa/ Agg AjO4
zmole Ag NOz reacds unth imoe af Ho A3O4
mole al AgNO3
= mole a scN
Step 2
Inihial mole ct Agnoz
= 44.0 x0. os854 = 0100257576"
moleal Agn3 used in Ag,AgOy termadion
19.69 x0il o)
ニ
6.c0160676 mole
moleaf izAsO4 =
O'00160676
= 5:3 55867X)öy
mole af As2O3 = 2x5.35506>X
= o.001071I3
muss af Asz 03=0:00107|/ 19
%3D
= 0,2)20924
y o4 Asz0z jn the mixture =
O,2)2092?5y x
J, 208
- 17:56%
Transcribed Image Text:Step 1 moleaf As =} mole af Asz O3 moleaf As adom = mole af Hq As O=molesa/ Agg AjO4 zmole Ag NOz reacds unth imoe af Ho A3O4 mole al AgNO3 = mole a scN Step 2 Inihial mole ct Agnoz = 44.0 x0. os854 = 0100257576" moleal Agn3 used in Ag,AgOy termadion 19.69 x0il o) ニ 6.c0160676 mole moleaf izAsO4 = O'00160676 = 5:3 55867X)öy mole af As2O3 = 2x5.35506>X = o.001071I3 muss af Asz 03=0:00107|/ 19 %3D = 0,2)20924 y o4 Asz0z jn the mixture = O,2)2092?5y x J, 208 - 17:56%
The arsenic in a 1.273-g sample of a pesticide was converted to H3 AsO4 by suitable treatment. The acid was then neutralized, and 42.00 mL of 0.05871 M AgNO3
was added to precipitate the arsenic quantitatively as Ag3 AsO4. The excess Ag* in the filtrate and in the washings from the precipitate was titrated with 9.58 mL of
0.1000 M KSCN, and the reaction was
Ag* + SCN → AgSCN(s)
Find the percentage of As2 O3 in the sample.
Percentage of As2 O3
Transcribed Image Text:The arsenic in a 1.273-g sample of a pesticide was converted to H3 AsO4 by suitable treatment. The acid was then neutralized, and 42.00 mL of 0.05871 M AgNO3 was added to precipitate the arsenic quantitatively as Ag3 AsO4. The excess Ag* in the filtrate and in the washings from the precipitate was titrated with 9.58 mL of 0.1000 M KSCN, and the reaction was Ag* + SCN → AgSCN(s) Find the percentage of As2 O3 in the sample. Percentage of As2 O3
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