a) Jim Bob analyses a buffer solution and finds it to contain in one liter: 0.220...
a) Jim Bob analyses a buffer solution and finds it to contain in one liter: 0.220 moles of HA, and 0.430 moles of the conjugate base A-. If the Ka for the weak acid is 3.6 X 10-5. what is the pH of the buffer?
b) Ephedrine (EP) is a weak acid, protonated amine which you take if you find yourself over weight, or falling asleep in class. You can buy the hydrochloride salt (HEP+)Cl (like the hydrochoride salt of NH3: NH4Cl). The hydrochloride salt dissolves completely, and the weak acid dissociates slightly as shown in the reactions below.
HEPCl ----> EPH+ + Cl-
EPH+ <----> H+ + EP
pKa = 9.65
Calculate the pH of a solution the has 6.00 grams of HEPCl (molar mass: 201.7) dissolved in 120 mL after 9 mL of 0.68 KOH has been added
I need help with these two problems, please.
Homework Answers
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a) Jim Bob analyses a buffer solution and finds it to contain in
one liter: 0.220...
Consider how best to prepare one liter of a buffer solution with pH = 3.36 using...
Consider how best to prepare one liter of a buffer solution with pH = 3.36 using one of the weak acid/conjugate base systems shown here. Weak Acid Conjugate Base Ka pKa HC2O4- C2O42- 6.4 x 10-5 4.19 H2PO4- HPO42- 6.2 x 10-8 7.21 HCO3- CO32- 4.8 x 10-11 10.32 How many grams of the sodium salt of the weak acid must be combined with how many grams of the sodium salt of its conjugate base, to produce 1.00 L of...
Consider how best to prepare one liter of a buffer solution with pH = 10.93 using one of the weak...
Consider how best to prepare one liter of a buffer solution with pH = 10.93 using one of the weak acid/conjugate base systems shown here. Weak Acid Conjugate Base Ka pKa HC2O4- C2O42- 6.4 x 10-5 4.19 H2PO4- HPO42- 6.2 x 10-8 7.21 HCO3- CO32- 4.8 x 10-11 10.32 How many grams of the sodium salt of the weak acid must be combined with how many grams of the sodium salt of its conjugate base, to produce1.00 L of a...
(17.2.c.6) Consider how best to prepare one liter of a buffer solution with pH = 10.76...
(17.2.c.6) Consider how best to prepare one liter of a buffer solution with pH = 10.76 using one of the weak acid/conjugate base systems shown here. Weak Acid Conjugate Base Ka pKa HC2O4- C2O42- 6.4 x 10-5 4.19 H2PO4- HPO42- 6.2 x 10-8 7.21 HCO3- CO32- 4.8 x 10-11 10.32 How many grams of the sodium salt of the weak acid must be combined with how many grams of the sodium salt of its conjugate base, to produce 1.00 L...
A buffer solution is able to maintain a constant pH when small amounts of acid or...
A buffer solution is able to maintain a constant pH when small amounts of acid or base are added to the buffer. Consider what happens when 1 mL of a 5 M solution is added or 0.005 mol of HCl are added to a 100.0 mL solution acetic acid buffer that contains 0.0100 mol of Acetic acid, HC,H,O,, and 0.0100 mol of sodium acetate, NaC,H,O,. The initial concentration of both the acid and the base are 0.0100 mol/ 0.1000 L...
help;( Data Sheet Titration and Buffers Name Date Part One: Buffer Solution (record the results from...
help;(
Data Sheet Titration and Buffers Name Date Part One: Buffer Solution (record the results from the video) Lab Section Number of Drops of HCl added to "water": Color changed from to Number of Drops of HCl added to "buffer": Color changed from to to Number of Drops of NaOH added to "water": Number of Drops of NaOH added to "buffer": _Color changed from Color changed from to Part Two: Titration Results for Acid-Base Neutralization (record the results from the...
A buffer solution is able to maintain a constant pH when small amounts of acid or base are added to the buffer. Consider what happens when 1 mL of a 5 M solution is added or 0.005 mol of HCl are added to a 100.0 mL solution acetic acid buffer that contains 0.0100 mol of Acetic acid, HC,H,O,, and 0.0100 mol of sodium acetate, NaC,H,O,. The initial concentration of both the acid and the base are 0.0100 mol/ 0.1000 L...
help;(
Data Sheet Titration and Buffers Name Date Part One: Buffer Solution (record the results from the video) Lab Section Number of Drops of HCl added to "water": Color changed from to Number of Drops of HCl added to "buffer": Color changed from to to Number of Drops of NaOH added to "water": Number of Drops of NaOH added to "buffer": _Color changed from Color changed from to Part Two: Titration Results for Acid-Base Neutralization (record the results from the...
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