Sulphuric Acid. Chloride Solution.
19.5 c.c. Clear Cloudy
19.75 " Clear Cloudy
20.0 " Finished Finished
20.25 " Cloudy Clear
20.5 " Cloudy Clear
The two methods of testing give the same result. But this balance is
disturbed in the presence of much nitre, the indications with baric
chloride being disturbed by an opalescence for some c.c. beyond the
finishing point. In solutions containing free hydrochloric or nitric
acid, a precipitate is obtained with either baric chloride or sulphuric
acid.
~Effect of Varying Sulphur.~--In these and the subsequent experiments
the titrations were performed in the presence of 10 grams of sodic
acetate and 10 c.c. of acetic acid in the manner already described.
Standard sulphuric
acid used 5.0 c.c. 10.0 c.c. 20.0 c.c. 50.0 c.c. 100.0 c.c.
"Baric chloride"
required 5.0 " 10.0 " 20.0 " 50.0 " 100.0 "
~Effect of Varying Temperature.~--With 5 c.c. of standard sulphuric acid
titrated at 15° C., 5 c.c. of baric chloride were required; but with
larger quantities the results were altogether unsatisfactory when
titrated cold.
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