The Preparation of Substances Important in Agriculture, a Laboratory Manual of Synthetic Agricultural Chemistry

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7. How much arsenic acid (AS2O5) in an ordinary lead arsenate paste?
8. If lead costs more than arsenic which is cheaper to use as a lead salt, the nitrate or the acetate? The analyses of lead arsenates given v\dll furnish the answer.
9. Calculate the per cents of AsoOs and PbO in PbHAs04 in the basic compound. This will be confus- ing unless the student keeps in mind the fact that the amount of two arsenics cannot be calculated where only one exists, i.e., AS2O5 cannot be calculated from Lead
...Arsenate 49 one molecule PbHAs04, whereas it can from two mole- cules. In other words the student is askt to resolv 2PbHAs04 into 2PbO, AsoOs and H2O, the water being neglected in this case.
10. What are the advantages of lead arsenate over Paris green?
LIME-SULFUR 36-80-50 Fonnula Lime-sulfur is an amber colord liquid con- taining calcium polysulfids, CaS4 and CaSs, and some calcium thiosulfate, CaS203. It is made by boiling lime with a suspension of sulfur. It first came into use as an insecticide on the Pacific coast about 1900 to combat the San Jose scale.


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