Mixing warm water

Solution B. Dissolve 86 5 g. of crystalline sodium potassium tartrate ( Rochelle salt, C4H40jNaK,4H20) in warm water. Dissolve 30 g. of pure sodium hydroxide in water. Mix the tartrate and hydroxide solutions, cool and make up to 250 ml. in a graduated flask. 

Warm about loo ml. of distilled water in a beaker to about 40 and with a portion of this thoroughly rinse out the mouth and reject the liquid. Again introduce about 20 ml. of the warm water into the mouth and mix with the saliva as completely as possible. Transfer the liquid so obtained into another beaker and then filter through a small fluted filter-paper into a small conical flask or boiling-tube. 

Place 10 g. of dry salicylic acid and 15 g. (14 ml.) of acetic anhydride in a small conical flask, add 5 drops of concentrated sulphuric acid, and rotate the flask in order to secure thorough mixing. Warm on a water bath to about 50-60°, stirring with the thermometer, for about 15 minutes. Allow the mixture to cool and stir occasionally. Add 150 ml. of water, stir well and filter at the pump. ReorystaUise the crude acetylsalicylic acid from a mixture of equal volumes of acetic acid and water. 

The treated water contains sufficient concentration of surface film-forming agents if cold water spends about 12 min and warm water at least 20 min in the tank [19]. Sudden temperature variations over 10°C must be prevented because the active form of Al(OH)3 is sensitive to them [20]. If mixing with cold water or subsequent warming cannot be avoided, a short-term electrolytic aftertreatment must be provided in a small reaction tank. The development of undisturbed protective films in the tubing assumes continuous water flow with forced circulation by pumps [20]. 

A hot-water heating system forces water into pipes, or arrangements of pipes called registers that warm from contact with warm water. Air in the room warms from contact with the pipes. Usually, the pipes are on the floor of a room so that warmer, less dense air around the pipes rises somewhat like a helium-filled balloon rises in air. The warmer air cools as it mixes with cooler air near the ceiling and falls as its density increases. This process is called convection and the moving air is referred to as convection current. The process of convection described here is pipe-to-air and usually does a better job of heating evenly than in an air-to-air convection system—the circulation of air by fans as in a forced-air heating system. 

Near room temperature most gases become less soluble in water as the temperature is raised. The lower solubility of gases in warm water is responsible for the tiny bubbles that appear when cool water from the faucet is left to stand in a warm room. The bubbles consist of air that dissolved when the water was cooler it comes out of solution as the temperature rises. In contrast, most ionic and molecular solids are more soluble in warm water than in cold (Fig. 8.22). We make use of this characteristic in the laboratory to dissolve a substance and to grow crystals by letting a saturated solution cool slowly. However, a few solids containing ions that are extensively hydrated in water, such as lithium carbonate, are less soluble at high temperatures than at low. A small number of compounds show a mixed behavior. For example, the solubility of sodium sulfate decahydrate increases up to 32°C but then decreases as the temperature is raised further. 

Medications available commercially as compressed tablets can be crushed for administration through feeding tubes. After such a tablet is crushed into a fine powder, it should be mixed with 10 to 30 mL of fluid (usually warm water) for... 

When Plaster of Paris, CaSC>4 5H2O (s), is mixed with water, solid gypsum, CaS04- 2 H2O (s), is formed in an exothermic reaction, that is, a heat-releasing reaction. Thus, as the cast hardens, the plaster cast becomes warm ... 

Extrapolating the regression line to the Y axis (0 seconds) gives a temperature of 41.4°C at the moment the room temperature and warm water were mixed. 

OH Warm water outside mixing zone 30-d avg. 0.002 pg/L CELDs1993... 

Experiment.—On a small hand balance, having two sheets of paper counterpoised in the pans, weigh out equal quantities (about 0-5 g.) of quinone and quinol dissolve the two substances separately in warm water and mix the solutions. Magnificent green needles of quinhydrone crystallise almost at once. After some time collect them at the pump, wash with water, and dry between filter papers over calcium chloride in a non-evacuated desiccator. Boil a few of the crystals with water and smell the vapours. 

Preparation of nitrile acetates from oximes with sodium acetate and acetic anhydride. Pentaacetyl-v-glucononitrile. If only the nitrile is needed, isolation of the oxime can be avoided. One hundred grams of anhydijous n-glucose was dissolved in 50 ml. of warm water, and maintaining the temperature at 60°, a solution of 28 g. of hydro-xylamine in 700 ml. of ethanol was added sufficiently slowly that no precipitation took place. After one hour at 65°, the reaction mixture was concentrated under reduced pressure to a thick sirup. The residue was mixed with absolute ethanol, the ethanol evaporated and the operation repeated in order to eliminate all water. One hundred and twenty grams of anhydrous sodium acetate and 700 ml. of acetic anhydride were added to the sirup, and the mixture was slowly and cautiously warmed in a water bath to 95°. It was advisable to agitate the flask continuously and to watch the... 

Bromine pentafluoride is a highly reactive compound combining explosively or with ignition with most elements and their compounds. Spontaneous explosion or flaming can occur when mixed with water, organic compounds, metal powder, metal hahdes, metal oxides, metal sulfides and chlorine (upon warming) (Patnaik, P. 1999. A Comprehensive Guide to the Hazardous Properties of Chemical Substances, 2nd ed. New York John Wdey). 

Nepal. Decoction of the rhizome, mixed with Artemisia dubia, is taken orally as an antipyretic. The juice is mixed with butter and massaged on the chest and throat to cure cough. The juice is taken orally for throat infection . Decoction of the rhizome, mixed with the Justicia adhatoda, is mixed in warm water and salt and then taken orally twice a day for 2-3 days to treat abdominal pain . 

Dichloro-tetrammino-iridium Chloride, [Ir(NH3)4Cl2]Cl.H20, is produced when dinitrito-tetrammino-iridium chloride is heated with ammonium chloride and concentrated hydrochloric acid for several hours. A yellow liquid is obtained, from which on evaporation a yellow crystalline precipitate separates containing the chloro-compound mixed with ammonium chloride. This is collected, dissolved in warm water, filtered, and allowed to crystallise on the addition of hydrochloric acid. It separates in yellow needles and prisms which are impure, but are purified on further reerystallisation from warm water containing acid. It loses water on heating, and finally leaves a residue of iridium. Concentrated hydrochloric acid does not attack the salt. 

A reactor charged with 4,4 -diphenylether-dicarboxylic acid, hydrazinesulfate, and polyphosphoric acid were mixed and reacted for 1 hour at 160°C and then further heated to 180°C. This mixture was then treated with 4-aminobenzenesulfonic acid and heated for an additional 2 hours. The molar solubility ratio of polyphosphoric acid/hydrazinesulfate and the molar monomer ratio ofhydrazinesulfatc/4,4 -dipheny-lether-dicarboxylic acid were kept constant at 10 and 1.2, respectively. The mixture was further treated with sufficient 4-aminobenzenesulfonic acid so that the molar ratio of in situ formed polyhydrazide was maintained at 1 1. After heating was stopped, the mixture was poured into warm water containing 5 wt% sodium hydroxide solution and a dark blue fiber obtained. The fiber was washed in distilled water and then dried in a vacuum furnace for 48 hours at 100°C. The dried material had a nitrogen/carbon ratio of 0.174 and a sulfur/carbon ratio of 0.058. The product had an Mw of... 

F. C. Mathers and C. G. Schluderberg 124 prepared indium iodate, In(I03)3, by mixing soln. of indium trichloride and potassium iodate. The precipitate is amorphous. The mixture was evaporated to dryness on a water-bath the residue extracted on a Gooch s crucible with warm water and dried in vacuo over sulphuric acid. The mass was dissolved in boiling nitric acid (1 10), and on evaporation white crystals of indium iodate were formed. 100 grms. of water at 20° dissolve 0 067 grm., and 100 grms. of nitric acid (1 5) at 80° dissolve 0 67 grm. of the salt. It also dissolves in dil. sulphuric or hydrochloric acid. The soln. in the last-named add decomposes with the liberation of chlorine. The crystals decompose with the evolution of iodine when heated by a free flame and explode if touched with a red-hot iron wire. 

A. Connell (1802) 140 obtained a white precipitate—ferrous iodate—by boiling a soln. of iron in iodic acid, and C. F. Rammelsberg found that the addition of potassium iodate to ferrous sulphate gives a yellowish-white precipitate which is decomposed when heated. It is sparingly soluble in nitric acid, and it dissolves in an excess of ferrous sulphate, and the soln., when heated, precipitates basic ferric iodate. A. Ditte mixed boiling soln. of a ferric salt and an alkali iodate and obtained a brown precipitate—ferric iodate—insoluble in hot nitric acid diluted with its own volume of water. Crystals can be obtained by mixing warm dil. soln. of ferric nitrate, acidified with nitric acid, and sodium iodate. The precipitate... 

Coating the Test Tube Walls with Silver. Mix the ammonia solution of silver with the glucose solution in the proportion 10 1. Pour 4-5 ml of the reaction mixture into the prepared test tube and lower the latter into a beaker with warm water (50-60 C). What do you observe Write the equations of the reactions. How can the walls of the tube be cleaned of the deposited silver ... 

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