What would be your best choice to prepare a 100 mL of pH 5.5 buffer strength 0.50 M? (pKa of acetic acid = 4.756; for NaHCO3: pK1=6.351 and pK2=10.329).
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What would be your best choice to prepare a 100 mL of pH 5.5 buffer strength 0.50 M? (pKa of acetic acid = 4.756; for NaHCO3: pK1=6.351 and pK2=10.329).
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- What is the mole ratio of sodium acetate to acetic acid (Ka=1.8 x 10^-5) in a buffer with the pH of 4.00? Report to 3 sig figsI was just wondering how you got the 4.0 x 10-4 for the acidionzation constant.How many grams of potassium napthenate (KC11H7O2; MW=210.27 g/mole; Kb=85x10-10) must be added to 50.0 ml of 0.4 M Naphthenic acid (HC11H7O2; Ka=5.4x10-5) to obtain a buffer with pH 5.0?
- You are asked to go into the lab and prepare an acetic acid -sodium acetate buffer solution with a pH of 4.00 ± 0.02. What molar ratio of CH3COOH to CH3COONa should be used?A solution containing Mg2+ was buffered to pH 9.99 and titrated with EDTA. Eriochrome black T, with p?a1 = 6.3 and p?a2 = 11.6 was used as the indicator. It is a diprotic acid, H2E What is the fraction of the predominant form of eriochrome black T in solution at this pH? (To answer this, report the alpha fraction of the indicator’s most prevalent species at this pH)You have performed an iodimetric titration using a commercial vitamin C tablet. Based on the following information below, calculate the %(w/w) of vitamin C(MM=176.16 g/mol) in the tablet: Mass of tablet dissolved in 250.0 mL: 5.422 g Aliquot volume of sample titrated: 25.00 mL Concentration of KIO3: 0.023 M Final burrette volume: 41.31 mL Initial burrette volume: 8.89 mL Blank volume: 0.14 mL
- What volume (V) of 0.100M (moles) KMnO4 would be required to Titrate 0.23g of K2{Cu(Cu2O4)2} * H20?The titration of 50.0 mL of 0.100 M acetic acid (Ka = 1.75 x10^-5) with 0.200 M sodium hydroxide at 25.0°C, after the addition of the following volumes of reagent: (a) 10.00 mL (b) 25.00 mL (c) 30.00mLCalculate the volume, in milliliters, of 0.170 M NaOH that must be added to 247 mL 0.0581 M 3‑(N‑Morpholino) propanesulfonic acid (MOPS) to give the solution a pH of 7.55. The pKa of MOPS is 7.18.
- Write the reaction between formic acid (Appendix B) and KOH. What is the equivalence volume (Ve) in the titration of 50.0 mL of 0.050 0 M formic acid with 0.050 0 M KOH? Calculate the pH at the points Vb 0.0, 10.0, 20.0, 25.0, 30.0, 40.0, 45.0, 48.0, 49.0, 49.5, 50.0, 50.5, 51.0, 52.0, 55.0, and 60.0 mL. Draw a graph of pH versus Vb. Without doing any calculations, what should the pH be at Vb5 12 Ve? Does your calculated result agree with the prediction?Suppose your colleague was relying on receiving your purified product in order to prepare a dilute aqueous standard solution of benzoic acid e.g. for a titration. She takes 160 mg of your benzoic acid and dissolves it in just enough water so the solution exactly fills a 250 mL volumetric flask. Given that the acid dissociation constant of benzoic acid Ka = 6.3 x 10-5, calculate the pH of her resulting solution.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.