c., and
the results were:--
Potassic iodide added 1.5 gram 3 grams 5 grams 10 grams
"Hypo" required 20.0 c.c. 20.1 c.c. 20.0 c.c. 20.0 c.c.
~Effect of Varying Bulk.~--In these experiments, 20 c.c. of copper
sulphate were taken, 3 grams of potassic iodide added, and also water to
the required bulk.
Bulk 20.0 c.c. 100.0 c.c. 200.0 c.c. 500.0 c.c.
"Hypo" required 20.0 " 20.0 " 20.0 " 19.9 "
In the last of these experiments the colour was discharged at 18 c.c.,
but gradually returned until 19.9 c.c. had been run in. It will be seen
that considerable variation in bulk does not interfere.
~Effect of Acetic Acid.~--These experiments were like the last series
mentioned, but the bulk was 100 c.c., and varying amounts of acetic acid
were added.
Acetic acid added 0 c.c. 1.0 c.c. 5.0 c.c. 10.0 c.c. 20.0 c.c.
"Hypo" required 20.0 " 20.1 " 20.1 " 20.0 " 20.2 "
Acetic acid, then, does not interfere to any serious extent.
~Effect of Varying Sodium Acetate.~--These experiments were like those
last mentioned, but without acetic acid, and with varying amounts of
sodium acetate.
Sodium acetate added 0 gram 1 gram 2 grams 5 grams 10 grams
"Hypo" required 20.0 c.c. 20.
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