Which salt could be dissolved in a solution of H2PO4-1 to make a buffer? NaF NaCl Na3PO4 Na2HPO4
Which salt could be dissolved in a solution of H2PO4-1 to make a buffer? NaF NaCl...
A 0.10 M solution of Na2HPO4 could be made a buffer solution with all of the following EXCEPT View Available Hint(s) O K3PO4 O Na3PO4 0 H3PO3 O NaH,PO4 Submit
Which of the following pairs of chemicals could be used to make a buffer solution? A.) NH3 and H2O B.) HCl and NaCl C.) NH3 and NH4Cl D.) CH3COOH and HCl
QUESTION 6 Which pair listed below could be used to make a buffer solution? NH3 and HCIO2 HCIO3 and NH3 HClO3 and HClO2 H2PO4 and H3PO4 H2S and H3PO4 H3PO4 and p3-
Goal- to make a 1L solution of phosphate buffer at pH 7.8 If you make up a 1M aqueous solution each of: NaH2PO4 and Na2HPO4 How much of each solution would you need to add (mix) to make up a 1 liter solution of 0.4 M phosphate at pH 7.8 Hint: the pKa for H2PO4- <-> HPO4 2- + H+ is 6.8)
A 1.0 Maqueous solution of which soluble salt will have the lowest freezing point? NaCl MgCl2 Not sure OCaCl2 Na3PO4
Question 39 Which combinations of compounds can make a buffer solution? O HNO2 and KNO2 O HBr and HCI O HI and NaCl O Lif and NaF
You are instructed to create 400. mL of a 0.39 M phosphate buffer with a pH of 6.2. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. (Enter all numerical answers to three significant figures.) H3PO4(s) + H20(I) =H30+ (aq) + H2PO4 (aq) Kai = 6.9x10-3 H2PO4 (aq) + H20(1) =H30+ (aq) + HPO42-(aq) Ka2 = 6.2 x 10-8 HPO42-(aq) + H20(1) = H30+(aq) + PO43-(aq) Ka3 = 4.8x10-13 Which of the available chemicals will you...
Which of the following weak acids and is salt could you use to make a buffer solution with a pH of 3.00? acetic acid/sodium acetate Ka - 1.8 x 10-5 hydrocyanic acid/sodium cyanide Ka - 4.9 x 10-10 phosphoric acid/sodium dihydrogen phosphate Ka - 7.5 x 10-3 Carbonic acid/sodium bicarbonate Ka = 4.3 x 10?
A buffer, consisting of H2PO4- and HPO42-, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system. What is the pH of a soft drink in which the major buffer ingredients are 7.30 g of NaH2PO4 and 7.80 g of Na2HPO4 per 355 mL of solution?
Part 1: Which pair of substances would make a good buffer system? a. H2PO4-/HPO42- b. H2PO4-/HPO42 c. SO42-/H2SO4 d. HCl/NaOH Part 2: Should the concentrations of the two buffer components be present at relatively high and concentrations close to each other or low with concentrations far from each other ? a. far and low b. close and high