2. a. What is the ratio of H2PO4 to H3PO4 at a pH of3? Phosphoric acid, pKal =2.12, pKa2 = 7.21, and pKa3 12.32 %3D %3D b. If 3 volumes of 9 mM NaOH are mixed with 1 volume of 20 mM Phosphoric acid (H3PO4), what will be the pH of the final mixture?
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- Malic acid is a weak diprotic organic acid with Ka1 = 4.0 × 10-4 and Ka2 = 9.0 × 10-5.a Letting the symbol H2A represent malic acid, write the chemical equations that represent Ka1 and Ka2 . Write the chemical equation that represents Ka1 × Ka2. b Qualitatively describe the relative concentrations of H2A, HA-, A2-, and H3 O+ in a solution that is about one molar in malic acid.c Calculate the pH of a 0.0175 M malic acid solution and the equilibriumconcentration of [H2 A].d What is the A2- concentrationin in solutions b and c?Bar Keepers Friend is a household cleaner containing oxalic acid, a diprotic acid where pKa1 = 1.27 and pKa2 = 4.27. If the molarity of oxalic acid in one bottle of Bar Keepers Friend is 0.458 M, explain how you would determine the fractional composition of the charge state [H2A] at pH = 3.98? Write out exactly how you would solve the problem (including plugging in the appropriate numerical values to solve the problem without actually calculating the final answer).Suppose a biochemist has 10 mL of a 1.0 M solution of a compound with two ionizable groups at a pH of 7.50. She adds 10.0 mL of 1.0 M HCl, which changes the pH to 3.80. The p?a value of one of the groups is p?1=4.10 and it is known that p?2 is between 7 and 10. What is the exact value of p?2? Enter your answer to two significant figures. p?2 = ??
- A reaction was carried out between 18 ml of a 0.05 M solution of hydrochloric acid with 24 ml of a 0.2 M solution of ammonium hydroxide with (Kb-1.8x 10-5) at a temperature of 25 C. What is pH and pOH respectively of the solution product after the reaction. Note that the molecular weight of ammonium hydroxide is 35 g /mole and the molecular weight of hydrochloric aeid is 36.5 q/mole.Propanoic acid (CH3CH2COOH) has a Ka of 1.3×10–5.FW(propanoic acid) = 74.08 g/mol; FW(calcium propanoate) = 186.22 g/mol a) At what pH will a solution of propanoic acid and sodium propanoate best resist changes to its pH? How do you know? b) 75 g calcium propanoate Ca(CH3CH2COO)2 is diluted to 150.0 mL with deionized water. 50.0 mL of a 3.0 M propanoic acid solution is added. Determine the equilibrium concentrations of each species and the pH of the resulting solution.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?
- A solution is made by mixing 50.0 mL of a stock solution of 2.0 M K2HPO4 and 25.0 mL of a stock solution of 2.0 M KH2PO4. The solution is diluted to a final volume of 200.0 mL. What is the pH of the resulting solution given that the pKa of H2PO4- is 6.82?For CO2 in the atmosphere at 25 degrees C, kH = 3.4 x 10-2 mol L-1 atm-1 and the partial pressure of CO2 is .000405 atm: Calculate the concentration of dissolved H2CO3 (aq) air-saturated rainwater. Determine the pH expected for rainwater on the basis of the first dissociation constant of the carbonic acid, H2CO3 (aq), from the dissolved CO2. The pKa values of carbonic acid are pKa1 = 6.35 and pKa2 = 10.33 at 25 C.Consider a triprotic acid, H3A, with pKa's of 5.00, 7.50 and 10.00. What is the pH of a 0.50 M Na2HA solution?
- 1. Pure water is neutral in pH or has a pH value of exactly 7.00. How does the pH of pure water vary when it undergoes distillation and boiling? Show the important equations if necessary, to explain why distilled and boiled water deviate from the neutral pH. 2. Some distilled water showed pH of 9.00 or marketed as alkaline water. What is the procedure involved in converting the pH of neutral water to basic? Show the necessary equations if possible. Can alkaline water help in the treatment of hyperacidity and gastroesophageal reflux disease? Explain your answer.To rule out metabolic acidosis in a patient's blood sample, the total carbon dioxide content should be measured (HCO3-+CO2), this was determined by acidifying the sample and measuring the volume of CO2 released. The concentration of H2CO3 was 28.5 mmol/L, the pH of the blood at 37 ℃ is 7.48 with a pka of 6.10, what is the concentration of HCO3- in mmol/L in the blood? a) 27.36b) 22.77c) 28.50d) 29.602,What is the pH of the solution with hydronium ion concentration of 6.3 x 10-12 M? Group of answer choices 10.80 12.60 11.20 11.80 10.20 3,Calculate the pH of 0.50 L of the solution containing 5.61.0g KOH dissolved at 25oC. Group of answer choices 13.30 13.00 0.33 13.70 1.33 4. Calculate the [H3O+]of the solution with pH=9.2. Group of answer choices 2.0 x 10-10 3.6 x 10-9 6.3 x 10-10 9.2 x 10-9 2.0 x 10-9