Dilute each of the other two samples (as an additional check) to 100 c.cs. Add to each of the first two samples two drops of methyl orange and titrate with the N/10 Na2CO3. at about 16° C.Ĭhecking and adjusting the Standard.-Measure out from the burette 4 samples of 20 c.cs. distilled water, and when cool transfer to the test-mixer and make up to 1000 c.cs. For present purposes the student may prepare a N/10 solution as follows:. Preparation of the Standard Solution.-A normal solution of H2SO4 contains 2 + 32 + 64/2 = 49 gms. The value and volume of the H2SO4 being known, the strength of the ammonia solution is easily calculated. After adding the indicator, the solution is titrated with a standard solution of H2SO4. Method, Reactions.-A certain volume of the ammonia solution is taken at a temptrature of 16° C. Pure Na2CO3 (prepared as before) is necessary for standardising the acid. For the standard acid pure H2SO4 of specific gravity 1.840 or thereabouts is most suitable. For analysis the student may take the bench reagent labelled 5E. Apparatus, Reagents,-The usual volumetric and gravimetric apparatus.
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