Chemistry

A buffer consisting of H2PO4- and HPO42-, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system. You were asked to prepare this buffer from K2HPO4 and KH2PO4. Identify the week acid and base components of this buffer solution and justify your choice.

  1. 👍
  2. 👎
  3. 👁
  1. K2HPO4 and KH2PO4
    The acid is the one with more H atoms; the base is the one with the fewer H atoms. So KH2PO4 is the acid and K2HPO4 is the base. The equilibrium is
    H2PO4^- + OH^- ==> HPO42- when strong base is added and
    HPO4^2- + H^+ ==> H2PO4^- when strong acid is added.

    1. 👍
    2. 👎
    👤
    DrBob222

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chem

    Complete the Bronsted lowry reactions HPO42-+H+ HPO42-+OH-

  2. Chemistry

    Phosphoric acid, H3PO4(aq), is a triprotic acid, meaning that one molecule of the acid has three acidic protons. Estimate the pH, and the concentrations of all species in a 0.300 M phosphoric acid solution. kPa1: 2.16 kPa2: 7.21

  3. Science

    The Ka for the H2PO4–/HPO42– buffer is given by the equation: Ka= ([HPO4^-2]gamma [H^+])/[H2PO4^-]=10^-7.20 What is the pH of a 2:3 mixture of H2PO4– to HPO42– at 0.10 M ionic strength? (See the table for the activity

  4. Chem 2

    Which of the following has the highest buffer capacity? A. 0.10M H2PO4-/0.10M HPO4 2- B. 0.50M H2PO4-/0.10M HPO4 2- C. 0.10M H2PO4-/0.50M HPO4 2- D. 0.50M H2PO4-/0.50M HPOr 2- E. They all have the same buffer capacity. Double

  1. Chemistry

    What would happen to the liquids in a human body if water did not have such a high boiling point? A. Fluids would accumulate B. Fluids could freeze C. Fluids could contract D. Fluids could boil * I don't understand this question,

  2. Chemistry(Please check)

    Which of the following equations correspond to the Ka2 for phosphoric acid? note: the double equal sign (==) means equilibrium. a) HPO42- (aq) + H2O (l) == H3O+(aq) + PO43-(aq) b) PO43- (aq) + H2O (l) == HPO42-(aq) + OH–(aq) c)

  3. chemistry, science

    Phosphoric acid is a triprotic acid: H3PO4(aq) +H2O(l) ↔ H3O+(aq) + H2PO4-(aq) Ka1 = 7.5 x 10-3 H2PO4-(aq) +H2O(l) ↔ H3O+(aq) + HPO42-(aq) Ka2 = 6.2 x 10-8 HPO42-(aq) +H2O(l) ↔ H3O+(aq) + PO43-(aq) Ka3 = 4.8 x 10-13

  4. Chemistry

    How would you prepare 1L of a .050 M phosphate buffer at pH 7.5 using crystalline K2HPO4 and a solution of 1 M HCl? pka of H2PO4 = 7.2

  1. Chemistry

    Could a buffer system employing H3PO4 as the weak acid and H2PO4^- as the weak base be used as a buffer system within cells? Explain. I know the answer is no but I'm not really quite sure how to explain why.

  2. chem

    write an equation for which component of the phosphate buffer (H2PO4-/ HPO4^2-) reacts when HCl is added. Do the same for NaOH. I think that the H2PO4- will react with the NaOH but its only a guess and I'm confused as to how I

  3. Chemistry

    4) Which of the following is the most effective buffer system for a pH value of 4.45? a. H2CO3/HCO3- (K1 = 4.4 * 10-7) b. HCO3-/CO32- (K2 = 4.7 * 10-11) c. H2S/HS- (K1 = 1.0 * 10-7) d. HC2O4-/C2O42- (K2 = 5.0 * 10-5) e.

  4. biochem

    If 10mL of 1 M HCl is added to 1L of 0.01 M phosphate buffer, pH 7.2, what is the resulting pH? Also what are the conc of H2PO4^1- and HPO4^2- in the final solution? HCl: M = mol / L 1M = mol / 0.01L = 0.01 mol phosphate: M = mol

You can view more similar questions or ask a new question.