A 2.00 g alkali sample is dissolved and diluted to 100.0 mL. Titration of a 25.00 mL aliquot to the phenolphthalein end point required 24.85 mL of 0.1440 M HCI. And an additional 24.00 mL to the methyl red end point. Identify the components and calculate % of each component.
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- 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.An alkaline sample of sodium compounds weighing 1.196 g was dissolved in water, cooled at 15 deg C, treated with 2 drops of phenolphthalein indicator and titrated with 1.058 N H2SO4 requiring 6.8 mL to render the solution colorless. Upon adding 2 drops of methyl orange and continuing the titration 16.5 mL more of the acid was needed to complete analysis. What is the quantitative composition of the sample?What volume of 0.317 M KOH solution will be required to titrate 25.00 ml of 0.285 MHNO3?
- A 25.00 ml of Ni2+ solution was diluted in HCl and treated with 25.00 ml of 0.05283 MNa2EDTA. The solution was neutralized with NaOH followed by addition of acetate buffer untilthe pH 5.5. The solution turns yellow after addition of few drops of xylenol orange indicator.Back titration using standard 0.022 MZn2+ at pH 5.5 requires 17.61 ml until end point, onwhich the solution will turn red. Calculate for the molarity of the unknown.A 0.5131-g sample that contains KBr (MM: 119.0023) is dissolved in 50 mL of distilled water. Titrating with 0.04614 M AgNO3 requires 25.13 mL to reach the Mohr end point. A blank titration requires 0.65 mL to reach the same end point. Report the %w/w KBr in the sample.A 0.500 g sample consisting of Na2CO3, NaHCO3, and inert materials was dissolved in sufficient water to give 250.0 mL of solution. A 25.00 mL aliquot of this solution was boiled with 50.00 mL of 0.01255 M HCI. Titration of the excess HCI to a phenolphthalein endpoint required 2.34 ml of 0.01063 M NaOH. The carbonate species in the second 25.00 mL aliquot was precipitated with an excess of BaCl2 and treated with 25.00 mL of the NaOH. Titration of the excess base required 7.63 mL of the standard acid. Calculate % Na,CO3 and NaHCO3 in the sample.
- 1. Titration of 0.485g sample by the Mohr method required 38.8mL of standard 0.1060 M AgNO3 solution. Calculate the percentage of chloride in the sample.10mL of a 10% by weight MgCl2 solution (density = 1.1 g / mL) is precipitated as magnesium ammonium phosphate after necessary processes, filtered and washed. The precipitate is dissolved in 50mL 1M HCl and excess acid is titrated with 2.0M NaOH solution in the presence of methyl orange. Find the NaOH consumption (Mg = 24,3g / mol, Cl = 35,5g / mol)The % (w/w) I- in a 0.6712-g sample was determined by Volhard titration. After adding 50.00 mL of 0.05619 M AgNO3 and allowing the precipitate to form, the remaining silver was back-titrated with 0.05322 M KSCN, requiring 35.14 mL to reach the endpoint. Report the %(w/w) I- in the sample. [Ans. 17.76 % (w /w)]
- A 0.5000 g sample contains NaHCO₃, Na₂CO₃ ,and NaOH, either alone or in permissiblecombination. Titration of a 50.0-mL portion toa phenolphthalein end point requires 25.1 mLof 0.100 M HCl. A second 50.0-mL aliquotrequires 50.2 mL of the HCl when titrated to abromocresol green end point. Deduce thecomposition, and calculate the percentcomposition of the substances. Find the mmol of Na2CO3, g of Na2CO3, and concentration of Na2CO3.A 3.7145 g portion of disodium EDTA dihydrate (M.W. 372.24) was dissolved in enoughdistilled water of prepare 1.000 L of solution. A 100.0 mL water sample was adjusted topH 10 and titrated to the Eriochrome Black T end point with 11.23 mL of the EDTAsolution. When the pH of another 100.0 mL water sample was adjusted to pH 12 andtitrated with EDTA, 2.11 mL of titrant was required. Calculate the concentration of Ca(II)and Mg(II) in the water. Express the answers in mg/L of CaCl2 and MgSO 4 , respectively.0.3g of MBr is dissolved in distilled water to make 250mL in a standard flask. 25 mL ofthis is titrated with suitable indicator against 0.02 M silver nitrate solution and the end point was obtained at 12.8 mL of AgNO3 solution. Calculate the RMM of the metal bromide.