2. If 6 g of phenol (weak acid, pKa 9.9) is distributed between 100 mL of an aqueous buffered solutie at pH 5 and 150 mL of mineral oil, how much phenol is left in the mineral ail layer? The partition coefficient for phenol in this system is 2.3.
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- when 15.00 mL of 2.00 x 10^-6 M lithium sulfate is mixed with 17.00 mL of 1.00 x 10^-6M sodium phosphate, what is the value of Qsp at the time of mixing?Find the Ksp of 0.200 M MgCl2 with Mg(OH)2 as its salt (solubility:1.51121E-05 M) MgCO3 as its salt (solubility: 1.78E-06 M)Consider a titration of 40.00 mL of 0.1250 M Na2CO3 with 0.4000 M HCl. Carbonic acid (H2CO3) has a pKa1 of 6.351 and a pKa2 of 10.329. What is the pH at the first equivalence point?
- 1. Will a 5% preparation of caffeine citrate compounded in citrate buffer, pH 4.8 with no additional co-solvents be a solution – Yes or No? Explain. The MW of caffeine is 194.19 Da and that of caffeine citrate is 386.3 Da. The intrinsic solubility of caffeine is 2.17g/100 mL. please explain the answer.Consider a titration of 40.00 mL of 0.1250 M Na2CO3 with 0.4000 M HCl. Carbonic acid (H2CO3) has a pKa1 of 6.351 and a pKa2 of 10.329. What is the pH at the second equivalence point?6. The quantitative determination of pyridoxine hydrochloride can be carried out by methods: A. Complexometry B. Argentometry C. Alkalimetry D. Acid-base titration in a protogenic solvent medium E. Acid-base titration in a profile solvent medium
- In solution, fentanyl is most stable in the pH range 3.5-7.5. What mass of acetic acid and sodium acetate would you need to manufacture 1L of 30mM pH 5.2 acetate buffer that could be used for fentanyl. The pKa of acetic acid is 4.6 and the relative molecular mass (RMM) of acetic acid and sodium acetate are 60 and 82 respectively.1. What is the molar solubility of PbCl2 in a solution of 0.23 M CaCl2? Ksp = 1.6 ✕ 10-5 for PbCl2. 2. 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. 3. What is the Qsp when 61.0 mL of 1.50 ✕ 10-4 M AgNO3 are mixed with 80.0 mL of 5.20 ✕ 10-3 M CaCl2? Assume the volumes are additive. Ksp = 1.6 ✕ 10-10. 4. What [I-1] is needed to start the precipitation of AgI from a saturated solution of AgCl? Ksp = 2.9 ✕ 10-16 for AgI and Ksp = 1.2 ✕ 10-10 for AgCl.Is a Kd value of 10.16 reasonable for the extraction of benzoic Acid between methylene chloride and water? Please explain using extraction theory.
- Transfer 3-4 drops or a pinch of the test compound (Acetanilide) to 3 ml of the solvents, 5% NaOH and 5% NaHCO3 Shake the mixture thoroughly. The time required for the solute to dissolve in the solvent should not be more than 2 minutes. Indicate with (+) or (-) if the test compound is soluble or insoluble in the solvent. What is the theoretical solubility of Acetanilide in 5% NaOH? _______ What is the theoretical solubility of Acetanilide in 5% NaHCO3? _______I was just wondering how you got the 4.0 x 10-4 for the acidionzation constant.0.641 g of a semi-synthetic alkaloid was dissolved in 25 ml of 1% w/v acetic acid and wasanalysed directly by HPLC. The solution was found to contain 1.42 mg/100 ml of an impurity.What is the level of impurity in % w/w and ppm? Calculate the pH of a buffer system made by dissolving 1.2 g of acetic acid and 0.82 g ofsodium acetate in 500 ml of distilled water (pKa of acetic acid = 4.7)