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The reactions involved are: MnO + 4HCl > MnCl + 2H O + Cl Cl + 2KI > I + 2KCl I + 2Na S O > 2NaI + Na S O Assuming that the weight of thiosulphate corresponding to the volume of sodium thiosulphate solution used is known, what is the corresponding weight of manganese dioxide? From the reactions given above, the following proportions may be stated: 2Na S O :I = 316.4:253.9, I :Cl = 253.9:71,
P.M. up mainsail and in royals; at 2h. made the signal for the squadron to prepare for battle, and, anchoring, bent the sheet cable through the larboard gun-room port to the sheet anchor; at 4h. set steering-sails, fresh breezes and fair; at 8h. moderate breezes, Cape Moulinau E.N.E. seven or eight miles; at 12h. At 12h. 30m.
The tracks and dung of cattle were observed; and this was the farthest point to the westward where we met with them. Kangaroos seemed to be very rare; but kangaroo rats were numerous. Black-fellows were very near to us last night; they very probably withdrew upon seeing us make our appearance. Oct. 10. Cloudy; wind northerly; thermometer at 2h. 30m. P. M. 88 degrees.
Calculate the percentage of potassium oxide in an impure sample of potassium carbonate from the following data: Weight of sample = 1.00 gram; HCl sol. used = 55.90 cc.; NaOH sol. used = 0.42 cc.; 1 cc. NaOH sol. = 0.008473 gram of KHC O .H C O .2H O; 2 cc. HCl sol. = 5 cc. NaOH sol. !Answer!: 65.68%. NaOH solution = 1.190 cc. HCl solution. !Answer!: 97.97%.
!Answer!: 20.08 cc. !Answer!: 5.70 cc. A sample of pyrolusite weighing 0.6000 gram is treated with 0.9000 gram of oxalic acid. What is the percentage of MnO , in the sample? !Answer!: 84.47%. A solution contains 50 grams of KHC O .H C O .2H O per liter. In the analysis of an iron ore containing 60% Fe O , a sample weighing 0.5000 gram is taken and the iron is reduced with sulphurous acid.
The next is the journal of Captain Hood of the Venerable. 6th July 1801. Monday, 6th July, wind variable off Algeziras, Gibraltar Bay, light breezes, and variable, the captain went on board the Cæsar, all sail set, squadron in company, the captain returned, got the sheet-cable through the stern-port, and bent it to the anchor, got springs on the sheet and bower-anchors; at 2h.
On the 29th of June, at two o'clock in the morning Mr. Cook, in conjunction with Mr. Green, observed an emersion of Jupiter's first satellite. The time here was 2h 18' 53", which gave the longitude of the place at 214 42' 30" west: its latitude is 15 26' south.
At two o'clock in the morning of the 20th, I observed, in conjunction with Mr Green, an emersion of Jupiter's first satellite; the time here was 2h 18' 53", which gave the longitude of this place 214° 42' 30" W.; its latitude is 15° 26' S. At break of day, I sent the boat out again with the seine, and in the afternoon it returned with as much fish as enabled me to give every man a pound and a half.
NaOH solution; 1 cc. NaOH = 1.743 cc. KHC O .H C O .2H O solution; Normal value NaOH = 0.12. !Answer!: 4.885. Given the following data: 25 cc. of a hydrochloric acid, when standardized gravimetrically as silver chloride, yields a precipitate weighing 0.5465 gram. 24.35 cc. of the hydrochloric acid are exactly equivalent to 30.17 cc. of KHC O .H C O .2H O solution.
That is, the complete equation of transformation would read: 2H + O = 2H O + 293,000 J. + X, involving all three entities, matter, energy, and mind, pertaining, respectively, to the realm of chemistry, of physics, and of psychology, or possibly a broader science of which psychology is one branch.
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