Volhard method. A total of 50.00 ml of 0.1048M AgNO3 is added to the sample and 15.38 ml of 0.3116 M KSCN is required for the back titration. What is the weight % Cl- (molar mass 35.453)? Select the correct response: 2.5% 1.75% 2.2% 0.150% 3.5%
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- Which of the following is a correc mass balance equation for a solution that is 0.15 M in H3ASO4: (Hint: H3ASO4 is a triprotic acid) O0.15 = 3(H3ASO4 ] + [H2ASC,]+ 2[HASO42-] + [ASO4 -] %3D [H3ASO4] + 3[H2ASO4 2[HASO42-] + [AsO4 -] [-e O 0.15 [H3ASO4] + [H2ASO4 ] + [HASO2²-] + [AsO4 3-] O .15 = + %3D %3D [-g "Os O0.15 = [H3ASO4] + [H2ASO4 + 2[HASO4 2-] + 3[AsO,1 2-1+3[AsO O 0.15 = [H3ASO4] + [H2ASO4 + [HASO4 2-] %3DAns. 17.15 mg. 54) A 1.000-g sample of a mixture which contains only NaCl and KCl gare a precipitate of AgCl which weighed 2.000 g. What are the percentages of Na and K in the mixture? ins 10 g Ans. 44.77% K; 5.75% Na. 1:J 55. I- can be sernarated from othorK2CO3(aq) + 2HC2H3O2(aq) yields 2KC2H3O2(aq) + H2O(l) + CO2(g) How many moles of H2O can be obtained from 25.0 ml of 0.150 M HC2H3O2?
- 0.0585 g Na2C2O4 10 mL to adjust KMnO4 solution prepared in 0.1 M'pure water, 2 M H2SO4 added, heating process and 8.4 mL titrant as a result of titration it's spin out. Calculate the actual concentration of potassium permanganate accordingly: The aluminum ( aw = 27) content of a 5 g sample is determined gravimetricaly by precipitating the aluminum as ALS: (150 g/mol) . If the weight of the precipitate is 0.5 g , calculate the percentage of aluminum in Ans=3.6% %3D 6. the sample ?2.23 gr sample taken from a bleaching powder is dissolved and completed to 250 ml. Taken from here 25One ml of sample is titrated with 33.02 ml of 0.1158 N Na2S2O3 solution after the necessary procedures. Bleachingactive chlorine in powder (OClCalculate the amount and percentage. (OCl: 51.5 g / mol)
- Five drops of dichlorofluorescein have been added to a solution containing 0.800 g sample which required 25.30 mL of 0.100 M AgNO3. (c) Calculate the weight percent NaCl in the original sample.A 0.1036-g sample containing only BaCl2 and NaCl is dissolved in 50 mL of distilled water. Titrating with 0.07916 M AgNO3 requires 19.46 mL to reach the Fajans endpoint. Report the % (w/w) BaCl2 in the sample. [Ans. 29.86 % (w /w)]If a buret of 15mL of standardized 0.0024 M K2CrO4 was added to a clean 100mL volumetric flask and diluted to the 100mL mark with NaNO3. What will be the concentration of CrO42- in the solution. Please show all the steps when solving. Thanks
- If 1.000 ml. of a solution of KMn04 is equiva- lent to 0.1000 millimole of NaCHO2 (sodium formate) in the fol- lowing titration: 3CHO2- + 2MnO- + H2O -> 3CO2 + 2MnO2 + 5OH-, what is the value of the KMnO4 in terms of grams of CaO in the volumetric method for calcium in which that element is precipitated as CaC2 4 .H2O and the precipitate is filtered, dis- solved in dilute H2S04 , and the oxalate titrated with permanganate?A 25.190 g sample of aqueous waste leaving a fertilizer manufacturer contains ammonia. The sample is diluted with 74.348 g of water. A 10.405 g aliquot of this solution is then titrated with 0.1058 M HCI. It required 28.58 ml. of the HCI solution to reach the methyl red endpoint. Calculate the weight percent NH, in the aqueous waste. wt% NH, %3D Potassium hydrogen phthalate (KHP) is often used as a primary standard in acid-base titrations. If 19.15 ml.L NAOH is required to neutralize 0.427 g KHP, what is the concentration of the NaOH? M concentration:Agency TEXAS UNITED REALTY Real Estate 75 g u cup increases by 2.44 70 V the heat change per mole of Cich dissolved in water Assame that all the heat is absorbed ed E. D 1 15) When aqueous solutions of Pb(NO3)2 and NaCl are mixed, PbCl2 precipitates. The balanced net ionic equation is: O to slom to slom I asdW (SC flot sdi of gaibros (2)OsH bas (2)5¹1 mot Pb2+ (aq) + 2C1- (aq) → PbCl2 (s) prisupe Pb2+ (aq) + 2NO3- (aq) → Pb(NO3)2 (s) H Pb2+ (aq) + 2NO3- (aq) -> Pb(NO3)2 (aq) Pb(NO3)2 (aq) + 2NaCl (aq) → PbCl2 (aq) + 2NaNO3 (s) laubon