A 15 mL sample of water from the lemur exhibit required 3.95 mL of a sulfuric acid titrant to reacht he endpoint. Calculate the alkalinity of the exhibit in mg/L of CaCO3 if the titrant conentration was 0.017 M. The molecular weight of calcium carbonate is 100.0869 g/mol. CaCO3(aq) + H2SO4(aq) --> CaSO4(aq) + H2O(1) + CO2(g)
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- A water sample has exact alkalinity of 220 mg/L CaCO3. The sample contains150.0 mg/L HCO3 at a pH of 7.1 (Temperature = 25 oC).(a) Calculate the carbonate alkalinity in mg/L as CO3.(b) Calculate the approximate alkalinity.(c) Comment on the difference between the exact and the approximate alkalinityA solution contains NaHCO3, Na2CO3, and NaOH, either alone or in permissible combination. Titration of a 40.0-mL portion to a phenolphthalein end point requires 24.1 mL of 0.100 M HCl. A second 40.0-mL aliquot requires 48.4 mL of the HCl when titrated to a bromocresol green end point. Deduce the composition and calculate the molar solute conc. of the original solutionTwo aliquot of a water sample is titrated against a strong acid using phenolphthalein and bromocresol green indicator. The volume for the bromocresol green endpoint is 13.5 mL and there was no apparent phenolphthalein endpoint, what is/are the probable source of alkalinity A. OH⁻ and CO₃²⁻ B. CO₃²⁻ C. OH⁻ D. HCO₃⁻
- If a water has a carbonate alkalinity of 120.00 mg/L as the ion and a pH of 10.30, what is the bicarbonate alkalinity in mg/L as the ionA 14.92 g sample of bacon is pureed in a blender with 100.0 mL of water. The suspension is filtered and the clear solution containing dissolved sodium nitrite is adjusted to pH 2. The solution is treated with 25.0 mL of 0.0150 M KMnO4 to oxidize the nitrite to nitrate and after standing for 10 minutes, the excess KMnO4 is back titrated with 15.0 mL of 0.0818 M FeSO4. What is the concentration of nitrite in the bacon as parts per million?The amount of CaCO3 in an antacid tablet was determined by back titration. An excess of HCl (50mls of 1.0M HCl) was added to four powdered tablets (total massof tablets 2.110g) and left overnight. The next day, 10ml aliquots of the solution wastitrated against 0.2M NaOH. An average titre value of 16.55mls was determined.Determine the amount of CaCO3 present in one tablet; express your answer as g/tablet and as %wt/wt.
- Two aliquot of a water sample is titrated against a strong acid using phenolphthalein and bromocresol green indicator. The volume for the phenolphthalein endpoint and for the bromocresol green endpoint are equal, what is/are the probable source of alkalinity A. OH⁻ B. CO₃²⁻ C. OH⁻ and CO₃²⁻ D. HCO₃⁻The pH of a 0.2L HNO2-NO2 buffer solution was determined to be 6.23. The solution was mixed with 4,.4g of HNO2. a. Considering that the pKa is 4.35, what is the approximate pH of the new solution? Show all pertinent calculations. The MW of acid = 47g/mol.An experiment was performed in order to determine the concentration of a persulfate ( S2O8^-2) solution 2 I^- (aq) + S2O8^2- (aq) —> I2 (aq) + 2 SO4^2- (aq) A 25.00 mL aliquot of .1500 M KI solution was titrated to a purple blue endpoint with soduim persulfate as the titrant. The intial buret reading was 1.25 mL and the final buret reading was 15.78 mL. Calculate the concentration of the soduim persulfate. Determine the oxidation number of iodine, sulfur, and oxygen in the reaction above and determine which species is oxidized and which is reduced.
- 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.A sample of meat scrap weighing 2.000 g is digested with concentrated sulfuric acid and a catalyst. The resulting solution is made alkaline with NaOH and the liberated ammonia distilled into 50.00 mL of 0.6700 N HCl. The excess acid then requires 30.10 mL of 0.6520 N NaOH for neutralization. What is the percentage of the protein in the meat? The Kjeldahl factor is 6.25.A mixture of 500.0 mg acid A and 250.0 mg acid B is titrated with 0.1150 N NaOH. The endpoint is overstepped on the addition of 45.30 mL of the base. The solution is backtitrated using 1.40 mL of 0.1234 N HCl solution. If the equivalent weight of A is thrice the equivalent mass of B, calculate the equivalent weights of A and B.