2. Prepare the burette with 0,025 M trilon-B solution and titrate water while constantly swirling until the color of solution changes to blue. Titrate carefully further until the last added drop will not change the blue color of the solution. 3. Repeat the titration until at least three consumed volumes of trilon-B do not differ more than 0.10...0.15 cm3. 4. Put the data obtained from titration into the table and calculate the average volume of the trilon B solution consumed (cm 3). C Water softening and determination of the residual total hardness Pour water through the sodium cationite filter and collect the softened water into a beaker or a conical flask. Determine total hardness of the softened water and assess efficiency of the filter. 1. Pipette 100 cm3 of the softened water into the clean conical flask (NB! Rinse pipette couple of times with a small amount of softened water), add ~5 cm3 of a buffer solution and a pinch (~0,1 g) of indicator ET-00. 2
4, (). Si Ge ( ) . . ( ), - . , . , . . . 3) , 1985 . 60- : , . , . : 100 , . : , . . . 22. ( , ) 8.5 , SiO2. : CaO, Na2O, K2O, Al2O3 . : , , , , .. : (SiO2), (Na2CO3), (K2CO3), (CaCO3), (Na2B4O7) . . , (). , : g . , . (softening point) - g. , (soda-lime glass) 700 1000, Pyrex 800 1200, 1600. : ( 1400). , , . . : , . , ] . - . (, .). , , .. , . . : CaO ; Cr2O3 ;MnO2 ; UO2 . . . . . , . - . . , . , . 23. . 8.6 . , : - ; - ; - . . , Al2(OH)4(Si2O5). -. . . , .. , . ,
· Mikropoorid (geeli-, adsorbtsioonvesi, kristallide vahelised poorid 1.5.3.5.Veeimavus. Water absorbtsion Veeimavus (w); on kapillaarjõudude toimel materjalisse imendunud vee hulk., sinna hulka ei loeta keemiliselt ühenditesse seotud vett. Kasutatakse ka mõistet veeimenduvuskiirus ( ka vee imenduvuskiirus) - näitab vee hulka kilogrammides, mis imendub materjali 1m2 suurusesse pinda 1 minuti vältel kui materjal on veega kokkupuutes 1.5.3.6.Pehmenemise koefitsient. Softening factor Pehmenemise koefitsient näitab immutatud materjali pehmenemist võrreldes immutamata materjaliga. Tavaliselt esitatakse immutatud ja kuiva materajli tugevuse suhtena: Kpehm = Rimm/ Rkuiv, kus 1.5.3.7.Hügroskoopsus, tasakaaluniiskus Omadust imada niiskust ümbritsevast (õhu-) keskkonnast nimetatakse hügroskoopsuseks. osa materjale saab niiskust osa eraldab antud temp. kõik liiguvad tasakaaluniiskuseks. 1.5.3.8.Ilmastikukindlus,
" "Remember what Dr. Travis says about calculated risks? When your shrink tells you to take some, you should take some. You can deal with it. You and Cross are both adults." He turned his attention back to his Internet search. "Wow. Did you know he doesn't turn thirty for another two years? Think of the stamina." "Think of the rudeness. I'm offended by how he just threw it out there. I hate feeling like a vagina with legs." Cary paused and looked up at me, his eyes softening with sympathy. "I'm sorry, baby girl. You're so strong, so much stronger than I am. I just don't see you carrying around the baggage I do." "I don't think I am, most of the time." I looked away because I didn't want to talk about what we'd been through in our pasts. "It's not like I wanted him to ask me out on a date. But there has to be a better way to tell a woman you want to take her to bed." "You're right. He's an arrogant douche
In addition to this tactical initiative, he had an overwhelming preponderance of forces. To his 11 battleships, 5 carriers, 16 cruisers, and 49 destroyers, Nimitz could oppose no battle- ships and only 3 carriers, 8 cruisers, and 14 destroyers. On May 20, Yamamoto issued an operations order that spelled out in detail the tactics to be used in the Midway assault. It was to begin on June 3 with a diversionary attack on the Aleutians. With Nimitz' forces thus pulled off balance, the softening-up would begin on the Midway defenders, to be followed on June 6 by a dawn assault. When the Pacific Fleet either hurried south from the Aleutians or sallied forth from Pearl Harbor to defend Midway, the numerically superior bombers and torpedo planes of the Japanese force would cripple it. Then Yama-motb's battleships and heavy cruisers would move up to sink its remnants by gunfire. The work of December 7 would be completed; a Japanese
Mildly alkaline compounds (pH tainers, and equipment. The pressure should 7–10) are used for manual cleaning. An be between 30–70 bar and the spraying example is sodium carbonate, which is used nozzle ≤15 cm from the surface to be cleaned; in many manual and heavy-duty detergent otherwise, the pressure being applied mixtures as a buffering agent and for its decreases rapidly. If hot water is used, the water softening capabilities. temperature should be 55°C at the nozzle, in Acid cleaning agents are used particularly order to achieve sufficiently high tempera- for removal of encrusted residues of dirt or tures at the surfaces, in particular for fat protein, or inorganic deposits (“scaling”). removal. Strong inorganic acids, hydrofluoride and Soak time prior to rinse-down should not hydrochloride, because of their corrosiveness
annaabi.ee 
