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equal volumes of the following pairs of solutions are mixed. Which pair will produce a buffer solution?

  1. HCHO2 and NaCHO2
  2. HCl and NaCl
  3. CH3NH2 and CH3NH3Cl
  4. NH3 and NaOH

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Lulama Klaas
Lulama KlaasLv10
17 Nov 2020

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Related questions

Determine the molar solubility of Al(OH)3 in a solution containing 0.0500 M AlCl3. Ksp (Al(OH)3) = 1.3 × 10-33.

Determine the molar solubility of MgCO3 in pure water. Ksp (MgCO3) = 6.82 × 10-6.

If the pKa of HCHO2 is 3.74 and the pH of an HCHO2/NaCHO2 solution is 3.11, which of the following is TRUE?

Answers:

[HCHO2] << [NaCHO2]

[HCHO2] < [NaCHO2]

[HCHO2] = [NaCHO2]

[HCHO2] > [NaCHO2]

It is not possible to make a buffer of this pH from HCHO2 and NaCHO2.

1. If the pKa of HCHO2 is 3.74 and the pH of an HCHO2/NaCHO2solution is 3.11 which of the following is true.
- [HCHO2] < [NaCHO2]
- [HCHO2] = [NaCHO2]
- [HCHO2] << [NaCHO2]
- [HCHO2] > [NaCHO2]
-it is not possible to make a buffer of this pH from HCHO2 andNaCHO2

2. You wish to Prepare an HC2H3O2 buffer with a pH of 4.24. If thepKa of this is 4.74, what is the ratio of C2H3O2-/HC2H3O2?

3. A Buffer Solution is 0.100 M in both HC7H5O2 and LiC7H5O2 andhas a pH of 4.19. Which of the following pH values would you expectfrom the addition of a small amount of a dilute solution of astrong base?
- 3.89
- 3.69
- 5.69
- 4.49
- There is not enough information.

4. Which of the following acids (listed with pKa values) and theirconjugate base would form a buffer with a pH of 8.10?
- HC7H5O2, pKa=4.19
- HF, pKa=3.46
- HClO, pKa=7.54
- HCN, pKa=9.31
- HClO2, pKa=1.96

118. A 250.0-ml buffer solution initially contains 0.025 mol of HCHO2 and 0.025 mol of NaCHO2. In order to adjust the buffer pH to 4.10, should you add NaOH or HCl to the buffer mixture? What mass of the correct reagent should you add?

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