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Updated: June 21, 2025
Carefully remove any drops of water which are on the inside of the neck of the flask above the graduation by means of a strip of filter paper, make the solution uniform by pouring it out into a dry beaker and back into the flask several times. Repeat the same operation. Wash out the flask with small quantities of water until it is clean, adding these to the 100 cc. of solution.
At this day I am assured there are scarce twoo of CC. tones beloninge to the whole citie of Bristowe, and very fewe or none of the like burden alonge the channell of the Severne from Glocester to the Landes Ende on the one side, and Milforde Haven on the other.
Iodine sol. = 15.59; 1 cc. Iodine sol. = 1.086 cc. Na S O sol.; 1 cc. Na S O = 0.005044 gram Cu. Calculate the percentage of sulphur. !Answer!: 0.107%. Given the following data, calculate the percentage of iron in a sample of crude ferric chloride weighing 1.000 gram.
Add 5 cc. of bromine water and boil until the excess of bromine is expelled. Then add 1-2 cc. of freshly prepared starch solution, and add thiosulphate solution, drop by drop, until the blue color is discharged. From the data obtained, including the "blank test" of the iodide, calculate the relation of the thiosulphate solution to the normal.
NaOH = 1 cc. of H PO solution of which 1 cc. will precipitate 0.01227 gram of magnesium as MgNH PO . Calculate the percentage of KHC H O . !Answer!: 88.67%. A one-gram sample of sodium hydroxide which has been exposed to the air for some time, is dissolved in water and diluted to exactly 500 cc.
The evolution flask should preferably be a wide-mouthed Soxhlet extraction flask of about 150 cc. capacity because of the ease with which tubes and stoppers may be fitted into the neck of a flask of this type. The flask should be fitted with a two-hole rubber stopper. The latter is to be preferred if a number of determinations are to be made in succession.
Who would lose and why? Assuming the impure NaOH used originally in making the titrating solution consisted of NaOH and Na CO only, what per cent of each was present? !Answers!: Customer lost; 3.94% Na CO ; 96.06% NaOH. In the standardization of a K Cr O solution against iron wire, 99.85% pure, 42.42 cc. of the solution were added.
PROCEDURE. Weigh out into 500 cc. beakers two portions of about 0.150-0.175 gram of potassium bromate. Run in thiosulphate solution from a burette until the color of the liberated iodine is nearly destroyed, and then add 1 cc. or 2 cc. of starch solution, titrate to the disappearance of the iodo-starch blue, and finally add iodine solution until the color is just restored.
CC are the high-pressure cylinders; DD the low pressure; EEEE the four parts forming the gimbal ring, to which are fixed in pairs the high and low pressure pistons, GG and FF; HHHH are the chair arms formed with the cylinders carrying pivots, IIII, which latter fit into the bearings, JJJJ, in the gimbal ring.
A single drop should color it permanently; if it does not, repeat the washing, until assured that the zinc is not contaminated with appreciable quantities of reducing substances. Wash out the beaker with dilute sulphuric acid, and follow the iron solution without interruption with 175 cc. of the warm acid and finally with 75 cc. of distilled water, leaving the funnel partially filled.
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