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- وام اول 1) 25 mL Ag No3 react with 5mM Nacl ý 35 ml of (AgNez ) silver Solution is required to titrate ZnClz are present inthe Sample: 2) Calculate the amount of lime( Ca0) that Gon be prepared by heating 200kg of limestone that is 95% Pure Cacos M.Wt. aCo3=lo0 M.wt Cao-56-1 Ca Co3 » Cao+ Co 3) What Volume of 12M and 3M HCl must be mixed to give $ 1 liter of 6M HCl 4) Cal Culate the molar Concentrationof acetic acid Solution which is z% ionized. 5) GI Culate he PHofu Sdution which results from the mixind of 50.0ml of o SM HCl which 5omL of o.4M NH3. ) CalCulate the extent of hydrolysis in a o.ol M Solutio-A 4.912-g sample of a petroleum product was burnedin a tube furnace, and the SO2produced was collectedin 3% H2O2.Reaction:SO2(g)+H2O2→H2SO4A 25.00-mL portion of 0.00873 M NaOH was introducedinto the solution of H2SO4, following whichthe excess base was back-titrated with 15.17 mL of0.01102 M HCl. Calculate the sulfur concentrationin the sample in parts per million.10. A 0.514 gram sample of NazCO, (106.0 g/mol) was dissolved in distilled water in a 100.0 mi volumetric flask. The molar concentration of Na,CO, in solution is: 0.0485 M 0.0370 M b. 0.4849 M 0.0340 M 0.0330 M d. е.
- How many grams of CaF2 will be soluble in 250 ml of 0.510 M KF solution? (ksp of CaF2 = 3.90 x 10-11) (atomic weights: Ca 40.0; K 39.1; O 16.0; F 19.0)Which compound has the lowest molar solubility in pure water at 25 °C? ZnS; Ksp = 2.0x10-25 %3D O CoS; Ksp = 5.9x10-21 O PbS; Ksp = 3.2x10-28 %3D O CuS; Ksp 7.9x10-374. Which of the following salts is the MOST soluble in water? * O KCIO: (Ksp = 2.5 x 10-2) O AgCI (Ksp = 1.0 x 10-12) %3D BaSO (Ksp = 1.2 x 10-10) BaCOs (Ksp = 5.0 x 10-)
- Q1) A sada- Lime Sample is 90% NaoH and 10% CaO• If 3gm is dissolved in 250 ml, what is the tutal normadity of the Selution as abase ? How many milliliters of O.57N H2 S@4 would be requiredd to titrate i00 me of the Solution ? Ans.s ( 0.309 N, 60.59 ml) Q12) How much water that required add to 200 ml HNO, ( densly = 1.285 gm/ml) Contains 46 wt% acid to Convert lo wt% acid solution? Ars. : 919.6 mlWhich are false? - purple solution of KMnO4 in burette may be cleaned using oxalate or peroxide - the burette should be washed with the titrant first before titration - HCl cannot be used in place of H2SO4 - MnO2 solids which may form during storage can be filtered out using a filter paper - KMnO4 solutions should be stored in an amber colored bottle protected by light to prevent oxidation - All are false - All are trueH1 gramof Sampleof an impure mixture af NARCOZ and Natteo, containing impurties is dissalved and tityated with SN Hel wit p colourless after addition5mD otacid-Methyt ge is then added and 22ontof, acid reguired orange tochange the of Naz coz benotphthalein as indicator, the sotudion Curns this indicator what is the percoulye and Na Heoz in the sample ?
- Yerleştirme Görüntü Paylaş Pencere Yardım Report Fe spectro 2 %125 Ekle Tablo Grafik Metin Ortamlar Yorum Answer the following questions. 1) The 40 mg/L Fe stock solution was prepared with iron (II) ammonium sulfate hesahystoate [Fe(NH.):(SO.):(H;O)«] rather than with iron (II) chloride [FeCl:). What is the reason of this choice? 2) For convenience, several glass or quartz cells are generally used spectrophotometrie analyses; these cells should be "matched" with regard to their.optical properties. a) Why they should match with each other? b) Suppose one of the cells has a light path that is slightly longer than the usual 1.00 cm. How would this affect the results of an analysis if the defect was not recognized? c) Explain how the "unmatched' cell problem can be solved? 3) Draw the scheme of single bcam spectrophotometer and state the function of each compartment sepcrately.An unknown sample containing mixed alkal (NaOH NaHCO or Na,CO) was analyzed using the double flask method, A 250 mg sample was dissolved in 250 m CO3 free water. A 20.0 mL aliquot of this sample required 11.3 ml. of 0.009125 M HCl solution to reach the phenolphthalein end point. Another 29.0 ml aliquot of the sample was bitrated to the bromocresol green endpoint using 31.1 ml of the standard acid. How many millimoles of the components are there in the original solid sample) 0-928 mmol No. 0.0103 mmol NaOH 0078 m N.CO Cannot be determined 012 mol NaC0, 197 minol NaHCO 129 mmol NaOH, 097ml NajcoUEid- base tit ration the Consentrat ion of ammonia Solution excess HCL was titrated ith o.07om Na, cO3 Solutian. The volume of Na, Coz Solution reguired was 15.50 ml using the following eguations: 2HCLem> + Na, COgcaps CO2 Cays + HzO1) t NaCL Calculate the concentration (molarity and ppm) of ammonia in the Original Solution.(MM of NHzis 17.031.9/4) 10.0 was by of o.10OMI HCE to Then