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Practice Exercise How many kilograms of sodium ascorbate and ascorbic acid are needed to make 10.0...
A buffer solution contains 0.59 mol of ascorbic acid (HC6H7O6) and 0.30 mol of sodium ascorbate (NaC6H7O6) in 3.70 L. Th...
A buffer solution contains 0.59 mol of ascorbic acid (HC6H7O6) and 0.30 mol of sodium ascorbate (NaC6H7O6) in 3.70 L. The Ka of ascorbic acid (HC6H7O6) is Ka = 8e-05. (a) What is the pH of this buffer? pH = (b) What is the pH of the buffer after the addition of 0.28 mol of NaOH? (assume no volume change) pH = (c) What is the pH of the original buffer after the addition of 0.11 mol of HI? (assume...
What masses of bromoacetic acid (CH2BrCOOH) and sodium bromoacetate (CH2BrCOONa) are needed to prepare 1.00 L...
What masses of bromoacetic acid (CH2BrCOOH) and sodium bromoacetate (CH2BrCOONa) are needed to prepare 1.00 L of pH = 2.500 buffer if the total concentration of the two components is 0.200 M?
How many grams of glyoxylic acid and sodium glyoxylate are needed to prepare 2.25 L of...
How many grams of glyoxylic acid and sodium glyoxylate are needed to prepare 2.25 L of a 1.90 M buffer at pH 3.70 ? The p?a of glyoxylic acid is 3.34 . Note: Use the monohydrate forms, HCOCO2H⋅H2O and HCOCO2Na⋅H2O glyoxylic acid needed: g HCOCO2H⋅H2O sodium glyoxylate needed: g HCOCO2Na⋅H2O
How many grams of solid sodium nitrite should be added to 0.500 L of a 0.114...
How many grams of solid sodium nitrite should be added to 0.500 L of a 0.114 M nitrous acid solution to prepare a buffer with a pH of 3.971 ? grams sodium nitrite = ------------ How many grams of solid ammonium chloride should be added to 0.500 L of a 0.134 M ammonia solution to prepare a buffer with a pH of 8.470 ? grams ammonium chloride = ------------ How many grams of solid sodium fluoride should be added to...
calculate the number of grams of CH3COONa * 3H2O (sodium acetate tri-hydrate) needed to make 250.0...
calculate the number of grams of CH3COONa * 3H2O (sodium acetate tri-hydrate) needed to make 250.0 mL of a CH3COOH (acetic acid)/ CH3COONa * 3H2O buffer. The target pH of the buffer is 5.25. The given concentration of [CH3COOH] is equal to 0.10 M. Ka = 1.80 x 10-5 for acetic acid. Use the Henderson-Hasselbalch equation to determine the ratio of [CH3COO-]/[CH3COOH] needed to make the buffer. pH = pKa + log([CH3COO-]/[CH3COOH]) Now calculate the concentration of acetate ion (CH3COO-...
How many grams of sodium nitrite, NaNO2 is required to make 1.00 L of a buffer...
How many grams of sodium nitrite, NaNO2 is required to make 1.00 L of a buffer that has a pH of 2.6? A total concentration of the acid and the salt of the conjugate base of 0.35 M is required to achieve the correct buffer capacity. Report your answers to 3 significant digits, but do NOT include units. answer is 3.74 If a buffer has a buffer capacity of 0.4 M and the concentration of the acid is 0.11 M,...
Suppose you want to make an acetic acid/acetate buffer to a pH of 5.00 using 10.0...
Suppose you want to make an acetic acid/acetate buffer to a pH of 5.00 using 10.0 mL of 1.00 M acetic acid solution. How many milliliters of 1.00 M sodium acetate solution would you need to add? The pKa for acetate buffer is 4.75.
Acid buffer described in Problem 21, you discover that your m ion? laboratory is out of sodium ac...
number 23
acid buffer described in Problem 21, you discover that your m ion? laboratory is out of sodium acetate, but you do have sodium hydroxide. How much (in moles and grams) acetic acid and til the pH on of the sodium hydroxide do you need to make the buffer? f th ola . Another alternative. Your friend from another labora- ory was out of acetic acid, so tries to prepare the buffer in Problem 21 by dissolving 41.02 g...
Calculate the amounts in grams of weak acid and conjugate base needed to make the buffer....
Calculate the amounts in grams of weak acid and conjugate base
needed to make the buffer.
Buffers Concentration Volume Weak Acid Conjugate Base sodium acetate pH Ka acetic acid Buffer 1 500 mL 4.75
Describe how to make 2.0L of a 2.00 M solution of sodium carbonate from solid sodium...
Describe how to make 2.0L of a 2.00 M solution of sodium carbonate from solid sodium carbonate(s). b. Describe how you can make a buffer with sodium carbonate(s) by adding hydrochloric acid. c. How many mL of 1.00 M HCl(aq) are needed to be added to 10.00 g of sodium carbonate to make a buffer at pH =10.00. Ka of HCO3- is 4.7 x 10-11.
number 23
acid buffer described in Problem 21, you discover that your m ion? laboratory is out of sodium acetate, but you do have sodium hydroxide. How much (in moles and grams) acetic acid and til the pH on of the sodium hydroxide do you need to make the buffer? f th ola . Another alternative. Your friend from another labora- ory was out of acetic acid, so tries to prepare the buffer in Problem 21 by dissolving 41.02 g...
Calculate the amounts in grams of weak acid and conjugate base
needed to make the buffer.
Buffers Concentration Volume Weak Acid Conjugate Base sodium acetate pH Ka acetic acid Buffer 1 500 mL 4.75
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