SECTION 2: THINKING 3. Predict the result of mixing equal volumes of 4.0 x 10-8 M Ca(NO3)2 with 8.0 x 102 M of NaF. Explain your prediction using appropriate calculations. Ksp for CaF2 = 4.0 x 10-11. 11
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- 3.A sample is known to contain NaOH, Na2CO3 NaHCO3 or compatible mixture of these together with inert matter. With methyl orange, a 1.100 g sample requires 31.40 mL of HCl ( 1.00 mL is equivalent to 0.0140g CaO). With phenolphthalein indicator, the same weight of sample requires 13.30mL of the acid. What is the percent composition of the sample? ww wwWhich compound has the highest solubility in pure water? O a. M9F2, Ksp = 6.9 x 10-9 %3D Ob. Agl, Ksp = 8.3 x 10-17 CaSO4, Ksp = 2.4 x 10-5 %3D O d. Ca3(PO4)2, Ksp = 1.2 x 10-26 %3D O e. Sr(OH)2, Ksp = 3.2 x 10-4 %3DWhat TWO things could be done to increase the solubility of a specific gas in solution? esc lock Edit Format Table 12pt v Paragraph Р !! 1 Q A 2 BIU * W S 3 Al E BV T² v 4 R % 5 D F T Ev Ev A 6 G 7 H To 188 O wo * 8
- 1. A solution is known to contain 38.04 ± 0.03 mM KCl, and you have taken an aliquot of this solution using a pipette calibrated to deliver 20.013 ±0.006 mL. Determine the number of moles of KCl that are delivered in the aliquot, including the absolute uncertainly in that value. 2. You deliver the aliquot taken in problem 1 into a volumetric flask with a volume of 250.00 mL ± 0.02 % and dilute the solution to volume in the flask using Dl water. What is the concentration of KCl in this flask, report your answer with the absolute uncertainty. 3. Tabulated below are replicate titration volumes for an analysis. What is the error (both absolute and percent) for the average titration volume?4. Predict the result of mixing 60.0 mL of 4.0 x 10- M Ca(NO3), with 20.0 ml of 8.0 x 10² M NaF. Explain your prediction using appropriate calculations. Ksp for CaF₂ = 4.0 x 10-¹ Calculations:Empirical formula is 6C. % of Sulphur= [S] x 100 S0.0- yd ebivic 32 x 100% = 50%m %3D [1 (32) +2(16)] (CH,)n=2x42 [Hint: M,= 2x V.D] (12+2)n=84; n=6; hence compound is C,H,2 Mg + 2HCI → MgCl, + H, 7A. 8. From the equation: alumoeluaalch = slumot leohioma 1mol Mg produces 1mol H, Or 24g Mg produces 22.4dm' H, ei sid 9B. Compare Q57 n negyoro lo on lsic CHAPTER 3 eo to easm yd. THE ATOMIC STRUCTURE. ELECTRONIC CONFIGURATION. PERIODICITY OF ELEMENTS. - The periodic classification of the elements is an arrangement of the elements in order of their A. atomic weights B. isotopic weights C. molecular weight D. atomic numbers E. atom masses (1978:Q5) SD . The nucleus of an atom contains A. protons only B. neutron only C. protons and electrons D. neutrons and electrons E. protons and neutrons not iso(1978:Q28) - The size(diameters) of five atoms are in order RHow much amount of solids (in grams) do you need to prepare the following solutions? 1. 500.0 mL 0.1000 M stock EDTA solutiona. Weigh an appropriate amount of Na2H2EDTA2H2O (FW=372.24) to the nearest 0.1 mg 2. 100.0 mL 0.0500 M stock Ca2+ solutiona. Weigh appropriate amount of pure CaCO3 (FW=100.09) to the nearest 0.1 mg into a 250 mL beaker.a 10g soil sample was gently stirred with 250 ml of 1.0 M CH3COO(NH4) solution for 24 h and centrifuged to separate the solution. The solution recovered after centrifugation was titrated with distilled water to a volume of 1 liter and analyzed for cations. Analytical results showed that the solution contained 20 mg/L Ca, 2 mg/L Mg, 1 mg/L K, and 0.5 mg/L Na. Calculate the number of cation exchange equivalents and express it in meq/100 g of soil1,2 g of marble (calcium carbonate) containing sand as the only impurity is dissolved in 50,0 cm of 1,0 mol.dm- HCI solution. The excess acid is neutralized by 13,5 cm3 of caustic soda (NaOH) of concentration of 2,0 mol.dm-3. Calculate the percentage of CaCO3 in the original mixture. 4.A mixture containing only KCl and NaBr is analyzed by the Mohr Method. A 0.3172-g sample is dissolved in 50 mL water and titrated to the Ag2CrO4 endpoint, requiring 36.85 mL of 0.1120 M AgNO3. A blank titration requires 0.71 mL of titrant to reach the same endpoint. Report the % (w/w) KCl and NaBr in the sample. [Answer should be 82.41 % (w /w)]A mixture containing only KCl and NaBr is analyzed by the Mohr Method. A 0.3172-g sample is dissolved in 50 mL water and titrated to the Ag2CrO4 endpoint, requiring 36.85 mL of 0.1120 M AgNO3. A blank titration requires 0.71 mL of titrant to reach the same endpoint. Report the % (w/w) KCl and NaBr in the sample. [Ans. 82.41 % (w /w)]10-27. A 10.231-g sample of window cleaner containing ammonia was diluted with 39.466 g of water. Then 4.373 g of solution were titrated with 14.22 mL of 0.106 3 M HCl to reach a bromocresol green end point. (a) What fraction of the 10.231-g sample of window cleaner is contained in the 4.373 g that were analyzed? (b) How many grams of NH3 (FM 17.031) were in the 4.373-g sample? (c) Find the weight percent of NH3 in the cleaner.SEE MORE QUESTIONS