Potassium carbonate solutions heat capacity

Figure 5-13. Heat capacity of potassium carbonate solutions.

Place about 120 cc. of pure water in a Pyrex beaker of 300 to 500 cc. capacity and heat to boiling. While warming the water, add 2.5 cc. of a solution of gold chloride (6 g. crystallized HAuC14-3H20 per liter) and 3 cc. of a solution of pure potassium carbonate (0.2... 

Preparation of carbon monoxide from formic acid 50e A round-bottomed flask (capacity 1 1) is fitted by ground-glass joints with a dropping funnel and a gas-outlet tube, filled two-thirds full with concentrated phosphoric acid, and heated in a water-bath to 80° then formic acid is dropped in slowly. For removal of impurities (carbon dioxide, air, acid vapors, water vapor), the carbon monoxide evolved is passed successively through 50% potassium hydroxide solution and an alkaline solution of sodium dithionate (25 g of dithionate in 125 ml of water containing also 20 ml of 70% potassium hydroxide solution) and over potassium hydroxide, calcium chloride, and phosphoric oxide. 

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