In the acetic acid determination in vinegar experiment; NaOH was standardized with 0.35 g KHP (molar mass = 204.22 g/mol). %3D The KHP was dissolved in 75.0 mL distilled water in a 250 mL Erlenmeyer flask and titrated to the endpoint colour by dispensing 11.40 mL of NaOH from the burette. Calculate the molarity of NaOH. O a. 0.35 M O b. 0.25 M O c. 0.20 M O d. 0.10 M O e. 0.15 M
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- John wanted to determine the protein content of his blood. To do so, he obtained 1.00 mLof blood, and diluted it to 10.00 mL. From that solution, he subjected 1.00 mL to Kjeldahl analysis. After digestion, the liberated NH3 was distilled in a flask containing exactly 25.00 mL of 0.0150 M H3BO3. Titration requires 5.85 mL of standard 0.0150 M NaOH to reach the desired endpoint. If a typical blood sample contains 15.45 g N per 100 g protein, calculatethe protein content (in g/mL) in the sample of John’s blood.A prednisolone solution contains 15 mg prednisolone per 10 mL. What is the percentage strength (w/v) of the prednisolone in this prescription? (Answer must be numeric; no units or commas; round the final answer to the nearest HUNDRETH.)What is the percentage purity of acetic acid if 2.6 grams required 32.5 ml of 0.994 N NaOH solution to reach the endpoint? Does it conform to USP requirements for acetic acid 3%-6%?
- The distribution ratio of iodine between an organic solvent and water is 8.00. If 50.0 mL of0.100 M aqueous iodine is shaken with 200 mL of the organic solvent until equilibrium isreached, how many milliliters of 0.0600 M Na2S2O3 is required to titrated a 25.0 mL aliquot ofthe organic phase?John wanted to determine the protein content of his blood. To do so, he obtained 1.00 mL of blood, and diluted it to 10.00 mL. From that solution, he subjected 1.00 mL to Kjeldahl analysis. After digestion, the liberated NH3 was distilled in a flask containing exactly 25.00 mL of 0.0150 M H3BO3. Titration requires 5.85 mL of standard 0.0150 M NaOH to reach the desired endpoint. If a typical blood sample contains 15.45 g N per 100 g protein, calculate the protein content (in g/mL) in the sample of John’s blood.bottle of Na2EDTA.2H2O is labeled with an assay of 100.5%, what is this implied? What is the result of heating to 100 ºC? How does the Eriochrome Black T indicator function?
- A 50.00 ml of a sample of river water was titrated with 0.0015M of sodium dichromate and required 11.50 ml to reach the endpoint. What is COD in mg of Oxygen /L and in molecules of oxygen/L?A 0.5843-g sample of a plant food preparation was analyzed for its N content by the Kjeldahl method, the liberated NH3 being collected in 50.00 mL of 0.1062 M HCl. The excess acid required an 11.89 mL back-titration with 0.0925 M NaOH. Express the results of this analysis in terms of (a) %N (b) %urea, H2NCONH2 (c) %(NH4)2SO4 (d) %(NH4)3PO4A dilute peroxide solution was prepared by quantitatively diluting 10 mL stock H2O2 (MW = 34.0147) to 250mL using a volumetric flask. 50 mL aliquot of the diluted peroxide solution was titrated using the previously standardized KMnO4 in problem 1. Titration of the sample required 29.00 mL titrant and the blank containing 50 mL 1:5 H2SO4 required 0.75 mL of the standard KMnO4. Calculate the concentration in %w/v of the stock H2O2. (Hint: H2O2 produces O2 under acidic condition). Follow sig. Fig
- A 0.1220 g vitamin C tablet was dissolves in acid. A 25.00 ml aliquot of 0.01740 M KIO3 was added along with excess KI. The resulting solution was titrated with 0.07210 M Na2S2O3, requiring 21.44 mL to reach the endpoint. calculate percent by weight of ascorbic acid in the tablet.What weight of strontium acetate containing 99% Sr(CH3COOH)2.½H2O must be used as sample in an assay according to the general method for alkali salts of organic acids if, after treatment of the ash with 50.00 ml of 0.5162 N hydrochloric acid, it is desirable to consume 30.00 ml of 0.4675 N sodium hydroxide in the back titration?1. What is the Qsp when 32.0 mL of 6.50 ✕ 10-7 M Na3PO4 are mixed with 41.4 mL of 5.50 ✕ 10-5 M CaCl2? Assume the volumes are additive. Ksp = 2.0 ✕ 10-29.