another question one with the blue check you! : Sample 6Fe +2Cr’ The excess K,Cr,O, was back-titrated with 8.53 mL of 0.00949 M Fe2 solution.

another question one with the blue check you! : Sample
6Fe +2Cr’
The excess K,Cr,O, was back-titrated with 8.53 mL
of 0.00949 M Fe2 solution. Calculate the concentra-
tion of iron in the sample in parts per million.
13-22. The arsenic in a 1.203-g sample of a pesticide
was converted to H3ASO4 by suitable treatment.
The acid was then neutralized, and 40.00 mL of
0.05871 M AgNO, was added to precipitate the ar-
senic quantitatively as Ag3AsO4. The excess Ag* in
the filtrate and in the washings from the precipitate
was titrated with 9.63 mL of 0.1000 M KSCN, and
the reaction was
(a) Calc
in th
(b) Cale
(c) Cale
(d) At
*13-27. (a) A C
Ag* + SCN ABSCN(s)
percentage of As,O3 in the sample.
*13-23. The thiourea in a 1.455-g sample of organic mate-
rial was extracted into a dilute H,SO, solution and
titrated wich 37.31 ml. of 0.009372 M Ho+
Find the

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