Which of the following is not a characteristic of a primary standard material a. High molecular weight b. High purity usually above 99.5% c. Not reactive with air components d. low solubility in aqueous medium e. None below or above
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- A salt solution (30% Na2CO3) weighing 1ton iscooled to 20C where the salt crystallizes asdecahydrate. What will be the crystal yield ifthe solubility is 21.5 kg anhydrous Na2CO3/100kg water? (assume that 3% of the totalsolution is lost by evaporation)1. Which of the following compounds can form hydrogen bonds with water?a. octaneb. HClc. NaCld. acetic acid2. Maria wants to determine the percent water content of an unknown hydrate of AB. Given the following data:mass of empty crucible - 12. 2784gmass of AB · xH20 + crucible - 17.4960gmass of AB + crucible - 15.1314gCalculate the % water content of the hydrate3. From the above data, give the correct formula for the hydrate. (AB₂ Molar mass = 129.84 g/mol)Caustic potash that has been exposed to air is found on analysis to contain 90.00% KOH, 2.38% K2CO3 and 7.62% H2O. What weight of residue will be obtained if 1.00 g of this sample is added to 46.00 mL of 1.00 N HCl and the resulting solution, after neutralization with 1.070N KOH is evaporated to dryness?
- Describe the preparation of 750 mL of 5.30 M H3PO4 from the commercial reagent that is 86% H3PO4 (w/w) and has a specific gravity of 1.71. Take ? mL the concentrated reagent and dilute to ? mL with water.Determine the percentage Fe in a sample of limonite from the following data:Sample : 0.5000g ; KMnO4 used = 50.00 ml ; 1.000ml of KMnO4 is equivalent 0.005317 g Fe,FeSO4 used = 6.00 ml; 1.000ml FeSO4 is equivalent 0.009200 g FeO ( ans 44.59 %)Chemical amusement. Fire without matches In a watch glass take few crystals of KMnO4+Conc.H2SO4, held cotton dipped in acetone or alcohol or ether with a tong, fire catches immediately .why?. Give reason (explaain in detail)
- It was found that solubility of benzoic acid in water at differont temjperatures Was aceording to the follewing tuble. Tc 6 0 40 30 Logs 1.20 Jimol 1.415 1.58 1.77 calculate tne Valux of the chanye in enthalpy graphically?An impure sample of Na3PO3 weighing 0.1 g is dissolved in 35 mL of water. A solution containing 45 mL of 3% w/v HgCl2, 30 mL of 10% w/v sodium acetate, and 10 mL of glacial acetic acid is then prepared. After digesting, filtering, and rinsing the precipitate, 0.2857 g of Hg2Cl2 is obtained. Report the purity of the original sample as % w/w Na3PO3.An exhausted zeolite softener was regenerated by passing 100 litres, of NaCl. Solution containing 150 gm per lit. of NaCl. How many lit. of a sample of H2O of hardness 300 ppm can be softened by this softener? (Given at wts. for C = 12, O = 16, Na = 23, CI = 35.5, Ca = 40).
- TWhich of the folle solution? Choose the will more more likely is added to the гад likely form when answer my. EDTA - Compter ca - EDTA - Compler 3. - my In- Cain. tathich of the following clour of metads is more 9 to form complex molecules with Lifand? す。 Alkalimetats 2. Alkali earth Transition metode none of these 3₁ 4. Likely1. The surface of silica gel has a structure shown in the diagram below : OH OH OH -0- Si- 0 Si Si – 0- main body of silica structure Suppose you used a plate coated with silica gel, with propanone, CH;COCH;, as the solvent for thin layer chromatography. Suppose also that the mixture you were trying to identify contained A compound, P, which could form strong hydrogen bonds. A compound, Q, which formed hydrogen bonds, but not as strongly as P. A compound, R, which was polar, relying on dispersion forces and dipole-dipole interactions for its intermolecular attractions. Describe and explain what the chromatogram would probably look like.A sample is known to consists of NaOH, or NaHCO3 or Na2CO3 or possible compatible mixture of these, together with inert matter. With methyl orange, a 1.100 g sample requires 31.4 ml of HCl ( 1.000ml is equivalent to 0.0140 g CaO). With phenolphthalein , the same weight of the sample requires 13.3 ml of the acid. Calculate the percent inert matter in the sample? ( ans. 17.7%)