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- 16. If all the N in 10.0 mmols urea, CO(NH2)2, is converted to NH4HSO4, and if with excess NaOH the NH3 is evolved and caught in 50.0 mL of HCl (1.00 mL ≈ 0.03000 g CaCO3), what volume of NaOH (1.00 mL ≈ 0.3465 g H2C2O4.2H2O) would be required for complete titration? 17. The percentage of protein in meat products is determined by multiplying the %N as determined by the kjeldahl method by the arbitrary factor 6.25. A sample of processed meat scrap weighing 2.000 g is digested with concd H2SO4 and Hg (catalyst) until the N present has been converted to NH4HSO4. This is treated with excess NaOH, and the liberated NH3 is caught in 50.0 mL pipetful H2SO4 (1.000 mL ≈ 0.01860 g Na2O). The excess acid requires 28.80 mL NaOH (1.000 mL ≈ 0.1266 g KHP). Calculate % protein in the meat scrap. 18. A 2.00 g sample of steel is burned in O2, and the evolved CO2 after passing through appropriate purifying trains is caught in 100 mL Ba(OH)2 solution. The supernatant liquid requires 75.0 mL HCl (1.00 mL…What is the pH of a buffer that is 0.12 M in lactic acid [CH3CH(OH)COOH, or HC3H5O3] and 0.10 M in sodium lactate [CH3CH1OH2COONa or NaC3H5O3]?For lactic acid, Ka = 1.4 * 10-4.What is the pH of the ethanoic acid solution CH3COOH 0.15 M with Ka = 1.8 × 10-⁵? b) What will be the pH when in 82 liters of 0.15 M solution of this acid we add 82 grams of sodium ethanoate CH3COONa?
- What volume of 0.317 M KOH solution will be required to titrate 25.00 ml of 0.285 MHNO3?What is the pH of the solution formed when 1.13 g of diethylammonium chloride ((CH3CH2)2NH2)+Cl- is added to 100.0 mL of 0.754 M diethylamine ((CH3CH2)2NH)?When H2SO4(aq) was reacted with NaOH(aq) in the titration, why was a precipitate not formed?
- The Tris buffer system is commonly used in biochemistry as its pKa of 8.1 allows it to buffer close to physiological pH. (CH2OH)3CNH2 + H+ Û (CH2OH)3CNH3+ What concentrations of Tris and Tris H+ are obtained in a 200 mL solution at pH 8.20 containing 6.1g of Tris? The molecular mass of Tris is 121.1 gmol-1 Please do this step by step thank you!8. The addition of acetic acid and ________ to water produces a buffer solution. A. HC2H3O2 B. KI C. KC2H3O2 D. NaNO3 E. NaBrWhat is the concentration of free Ag+(aq) in a solution that is initially 0.01254 M in AgNO3 and 1.04842 M NH3? These two compounds react together to form [Ag(NH3)2]+. Kf([Ag(NH3)2]+) =1.600e7 1.023 7.484e-10 0.01254 6.250e-8
- What is the pH of a 0.1848 M H2NCH2COONa? Ka for H2NCH2COOH is 4.50e-3The desired pH is 6.4 in creating a buffer system/buffer solution of about 50-60mL. Therefore, a student picks Silicic Acid Si(OH)4, as 1mL of 1M of the acid has a pH of 6.4, which also has a pKa of 9.82. What is the ratio HA/A- and ratio A-/HA-? The buffering capacity will be checked by the addition of 1mL of 1M HCl or 1mL of 1M NaOH and should not change by more than 0.25pH units.Tris(hydroxymethyl)aminomethane [(HOCH2)3CNH2—Tris, or THAM] is a weak base frequently used to prepare buffers in biochemistry. Its Kb is 1.2 × 10−6 and pKb is 5.92. The corresponding pKa is 8.08, which is near the pH of the physiological buffers, and so it exhibits good buffering capacity at physiological pH. What weight of THAM must be taken with 100 mL of 0.50 M HCl to prepare 1 L of a pH 7.40 buffer?