The chemistry of plant and animal life . colorby the alkali; then slowly add HClfrom the other burette, constantlystirring the solution in the beakeruntil a decided change in color isobserved. When all of the NH^OHhas been neutralized, the solutionhas a yellowish red color. Note thenumber of cubic centimeters ofHCl used for neutralizing the 20 NH^OH solution. Add a dropor two from the NH^OH buretteand note if there is a change ofcolor. When the solution is neu-tralized, one or two drops of HClor NH^OH should give a decidedchange of color. If too much acidhas been used, add a measuredamou
The chemistry of plant and animal life . colorby the alkali; then slowly add HClfrom the other burette, constantlystirring the solution in the beakeruntil a decided change in color isobserved. When all of the NH^OHhas been neutralized, the solutionhas a yellowish red color. Note thenumber of cubic centimeters ofHCl used for neutralizing the 20 NH^OH solution. Add a dropor two from the NH^OH buretteand note if there is a change ofcolor. When the solution is neu-tralized, one or two drops of HClor NH^OH should give a decidedchange of color. If too much acidhas been used, add a measuredamount from the NH4OH buretteuntil the solution is note the total quantity ofHCl and NH^OH used. Repeat thisexperiment, using 20 cc. of theHCl solution. Questions. (i) What was formedwhen the HCl neutralized theNH^OH solution? (2) Write thereaction. (3) What would be theresult if the neutralized solutions ^^^ were evaporated to dryness? (4) Calculate the amount of HCl re-quired to neutralize i cc. of 78 AGRICULTURAI. CHEMISTRY Experiment ii.—Neutralization. Repeat Experiment lo, usingdilute HjSO^ and NaOH solutions that have been prepared for thisexperiment. After completing the experiment, clean the burettesthoroughly and return them to the instructor. Questions, (i) What was formed when HjSO^ neutralizedNaOH? (2) Write the chemical reaction. (3) What was formedas the products of this reaction? (4) How can the salt product beobtained? (5) In writing the reaction, why do we vise 2NaOH in-stead of NaOH? (6) How does the product of Experiment 10differ from the product of Experiment it? (7) What otheracids could be used for neutralizing NaOH and NH4OH ? (8) Whatother bases could be used for neutralizing HCl and HjSO^?(9) What is an acid? (10) What is a base ? (11) What Is a salt?(12) Which do we find most abundantly in nature, acids, bases, orsalts ? Why ? Experiment 12.—Preparation of a salt. Put 10 cc. diluteHCl and 10 cc. water into the
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