4.87
4.92
4.71
4.99
4.57
A student prepares a buffer by adding 200.0 mL of 2.0 M NaOH to 500.0 mL of 2.0 MCH3CH2COOH. What is the pH of this buffer? Ka = 1.3 × 10–5 |
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4.87 4.92 4.71 4.99 4.57 A student prepares a buffer by adding 200.0 mL of 2.0...
A student prepares a buffer by adding 200.0 mL of 2.0 M NaOH to 500.0 mL of 2.0 M CH3CH2COOH. What is the pH of this buffer? Ka = 1.3 × 10–5
A buffer is prepared by adding 300.0 mL of 2.0 M NaOH to 500.0 mL of 2.0 M CH3COOH. What is the pH of the buffer?
A buffer is prepared by mixing 200.0 mL of 0.1500 M NaOH with 200.0 mL of 0.200 M CH3CO2H in a 1-L volumetric flask and then diluted to volume with distilled deionized water. Calculate the pH of the buffer. Ka = 1.75 x 10-5
A buffer is prepared by mixing 200.0 mL of 0.1500 M NaOH with 200.0 mL of 0.200 M Benzoic Acid (a monoprotic carboxylic acid) in a 1-L volumetric flask and then diluted to volume with distilled deionized water. Calculate the pH of the buffer. Ka= 6.28 × 10−5and pKa= 4.01. A. 3.53 B. 4.01 C. 4.49 D. 7.00 E. 11.49
For each of the following solutions, calculate the initial pH and the final pH after adding 0.0200 mol of NaOH. 1.For 200.0 mL of pure water, calculate the initial pH and the final pH after adding 0.0200 mol of NaOH. 2. For 200.0 mL of a buffer solution that is 0.220 M in HCHO2 and 0.315 M in KCHO2, calculate the initial pH and the final pH after adding 0.0200 mol of NaOH(Ka=1.8⋅10−4).
CHEM107 ACID_BASE BUFFERS AND PH UNIT-25 CTO-13: You have 500.0 mL of a buffer solution containing 0.20 Macetic acid CH3COOH) and 0.30 M sodium acetate (CH3COONa). What will the pH of this solution be after the addition of 20.0 mL of 1.00 M NaOH solution? (Ka=1.8 x 10-51 1) 4.41 B) 4.74 C) 4.56 D) 4.92 E) 5.07
A student prepares a 100.0-mL buffer solution that is 0.200 M in hydrofluoric acid and 0.200 M in sodium fluoride. How many grams of sodium hydroxide should be added to the buffer solution to change its pH to 4.00? (Assume no volume change upon adding the sodium hydroxide). I'm seeking the detailed work in finding the solution to this problem. Many thanks!
Page < 4 > of 6 ZOOM 8. A student prepares a buffer by adding 0.05 mol of potassium hydroxide to 0.10 mol of phenol (PhOH, pka = 10.0) to make 1.0 L of an aqueous solution. (a) What is the weak acid in this buffer? (b) What is the weak base in this buffer? (c) What is the pH of this buffer? Do not use any equations. Instead, explain your reasoning in words.
How many moles of NaOH need to be added to 200.0 mL of a 0.200 M solution of HF to make a buffer with a pH of 3.50? (Ka for HF is 6.8 x 10-4)
4. An aqueous buffer solution if made from 150.0 mL of a 1.50 M HCN solution and 200.0 mL of a 1.00 M NaCN solution. The Ka for HCN is 4.90 x 10-10. a. Calculate the initial pH of this buffer solution. b. Calculate the pH after adding 100.0 mL of 0.800 M HBr to the HCN/NaCN buffer. c. Calculate the pH after adding 100.0 mL of 0.800 M KOH to the HCN/NaCN buffer.