11-In the reaction with ascorbic acid each molecule of iodine a) loses 2 electrons b) It gains 3 electrons. c) gain 2 electrons d) gain 1 electron e) lose 1 electron f) loses 3 electrons

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Chapter1: Chemical Foundations
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11-In the reaction with ascorbic acid each molecule of iodine
a) loses 2 electrons
b) It gains 3 electrons.
c) gain 2 electrons
d) gain 1 electron
e) lose 1 electron
f) loses 3 electrons
12-The amount of ascorbic acid in a sample of orange juice was determined by
titration with potassium iodate. A 30 mL sample of juice was titrated with 4 mL of
0.007 M potassium iodate. Indicate the concentration of ascorbic acid in mg/100 mL in
the sample.
a) 0.015
b) 0.005
c) 0.49
d) 0.16
e) 49.3
f) 16.4
e) 0.018
g) 0.006
h) 0.60
i) 0.20
j) 60
k) 20
Transcribed Image Text:11-In the reaction with ascorbic acid each molecule of iodine a) loses 2 electrons b) It gains 3 electrons. c) gain 2 electrons d) gain 1 electron e) lose 1 electron f) loses 3 electrons 12-The amount of ascorbic acid in a sample of orange juice was determined by titration with potassium iodate. A 30 mL sample of juice was titrated with 4 mL of 0.007 M potassium iodate. Indicate the concentration of ascorbic acid in mg/100 mL in the sample. a) 0.015 b) 0.005 c) 0.49 d) 0.16 e) 49.3 f) 16.4 e) 0.018 g) 0.006 h) 0.60 i) 0.20 j) 60 k) 20
5-Problem. Precipitation volume. A volumetric technique was applied to determine
KCI in a 20 ml injection. To do this, 5 mL of the drug was measured and made up to
100 mL with distilled water. Then, to a 25 mL aliquot of this solution, 30 mL of 0.1 M
AgNO3 and 3 drops of indicator solution were added. It is worked at strongly acidic
pH. The excess of silver nitrate was titrated with 7 mL of KSCN 0.2 M until color
changed to red. What is its concentration in mg/mL and grams, in the injectable?
grams
mg/mL
0.0016
0.48
1.91
O
95.42
a) indirect valuation
b) direct assessment
c) displacement valuation
7-Indicator used in the problem of Vol. of precipitation
a) Potassium chromate
b) Fluorescein
c) ammonium iron sulfate
8-The KIO3 used in the laboratory is a
a) Primary standard
b) Secondary pattern
9-Ascorbic acid is an agent
a) Weak reducer
b) strong reducer
10-Starch degrades in solutions with high concentrations of 12
a) true
b) False
O
0.12
O
6-Indicate the type of titration used in the determination of KCI in the previous
problem
Transcribed Image Text:5-Problem. Precipitation volume. A volumetric technique was applied to determine KCI in a 20 ml injection. To do this, 5 mL of the drug was measured and made up to 100 mL with distilled water. Then, to a 25 mL aliquot of this solution, 30 mL of 0.1 M AgNO3 and 3 drops of indicator solution were added. It is worked at strongly acidic pH. The excess of silver nitrate was titrated with 7 mL of KSCN 0.2 M until color changed to red. What is its concentration in mg/mL and grams, in the injectable? grams mg/mL 0.0016 0.48 1.91 O 95.42 a) indirect valuation b) direct assessment c) displacement valuation 7-Indicator used in the problem of Vol. of precipitation a) Potassium chromate b) Fluorescein c) ammonium iron sulfate 8-The KIO3 used in the laboratory is a a) Primary standard b) Secondary pattern 9-Ascorbic acid is an agent a) Weak reducer b) strong reducer 10-Starch degrades in solutions with high concentrations of 12 a) true b) False O 0.12 O 6-Indicate the type of titration used in the determination of KCI in the previous problem
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