Chemistry

posted by .

Explain clearly which out of the following combinations of solutes would result in the formation of a buffer solution?
A) NH3 and HCl in a 2:1 molar ratio
B) HCl and NaOH in a 1:2 molar ratio
C) NH3 and NH4Cl in a 2:1 molar ratio
D) NaOH and CH3COOH in a 1:1 molar ratio

And: Why is the molar ratio important?
Thanks for the help.

  • Chemistry -

    For a buffer you want a weak acid and its conjugate base OR a weak base and its conjugate acid.
    A In a 2:1 molar ratio you will get all of the HCl used up and form NH4Cl so the final solution will be NH3 and NH4Cl which is a buffer. You look at the others.

  • Chemistry -

    Here is what I got :
    a) formation of a buffer solution
    B) strong acid and strong base, no formation of a buffer solution.
    C) formation of a buffer solution
    D) strong acid and weak base, formation of a buffer.

    Am I correct?
    thank you

  • Chemistry -

    Right on all but D. Since you have EXACTLY 1:1 ratio that means that the strong acid will exactly neutralize the weak base leaving you with the salt ONLY. You have half of what you need but not the other half.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Chemistry

    Which of the following mixtures will result in the formation of a buffer solution if all solutions are 1.0 M before mixing?
  2. Chemistry-Titration

    Acid (Unknown) Solution: HCL Molar Ratio: 1:1 Volume:20 ml Concentration:?
  3. Chemistry

    A few questions I don't really get and need to see the work for A 50.0 mL sample of 0.55 M benzoic acid, C6H5COOH, a weak monoprotic acid, is titrated with 0.51 M NaOH. Calculate the pH at the equivalence point. Ka of C6H5COOH = 6.5 …
  4. chem

    Which of the following pairs of substances, when mixed in any proportion you wish, can be used to prepare a buffer solution?
  5. Chemistry(Please check)

    Which of the following mixtures will be a buffer when dissolved in 1 liter of water?
  6. Chemistry

    Calculate the molar enthalpy for the following reaction. HCl(aq) + NH3 (aq) --> NH4Cl (aq). HCl = 50 ml (2.00M) NH3 = 50 ml (2.05 M) Delta T = 9.28 degrees Celsius. Ccal = 28.9J/g degrees celcius.
  7. Chemistry

    Which of the following result in buffered solutions when equal volumes of the two solutions are mixed?
  8. Chemistry

    A buffer solution is prepared by mixing 50.0 mL of 0.300 M NH3 with 50 mL of 0.300 NH4Cl. The pKb of NH3 is 4.74. NH3 + H2O-> NH4+ +OH- 7.50 mL of 0.125 M HCl is added to the 100 mL of the buffer solution. Calculate the concentration …
  9. chemistry

    0.02 Moles of HCl were added to a buffer solution, prepared by fluxing 20 L of gaseous NH3 and 10 L of gaseous HCl, both measured in normal conditions, in 2L of water. Calculate the pH of the solution before and after the HCl addition. …
  10. Chemistry

    How do I find the molar enthalpy H (kJ/mol) for reaction of NH3 + HCl -> NH4Cl at temp 9.8 celsius by using Hess's Law. I do not understand why there are unknown variables and how to use that to find the molar enthalpy. PLEASE HELP. …

More Similar Questions