and the cover are washed, 4 drops of 0.1 per cent alcohol solution of dimethylaminobenzene are added, and the solution is titrated with 0.25 N sodium hydroxide to a slight pink color of the indicator. The number of cubic centimeters of 'acid required to dissolve the precipitate of calcium carbonate multiplied by 1.4 gives the per cent of CaO in the sample.
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