difficult

  1. Y

    Difficult buffer question...

    Question - You will prepare 2 buffer solutions, one which is pH 5.2 and one which is pH 8.8. Solutions available: 1M NH3, 1M NH4Cl, 1M ethanoic acid, 1M sodium ethanoate solution. Calculate how much of the above solutions you need to make 100cm3 of each buffer. Use the equation pH = pKa - log...
  2. K

    Difficult Stoichiometry Questions?

    Hello, The title really says it all. I was just wondering if anyone could help me by sharing any difficult stoichiometry questions which you may know of. These questions can range from Redox, Solution, Equilibrium constant reactions, Gas-Law problems, Classical-Stoichiometry, Limiting-reagent...
  3. J

    Difficult chemistry question. RESPECT if you can do it :)

    'An equilibrium constant can be determined using the following method: Methyl ethanoate and water react to form methanol and ethanoic acid. The equilibrium establishes slowly: CH3COOCH3 + H20 ⇄ CH3COOH + HOCH3 ΔH= -60.2K mol-1. To obtain Kc, student does the following: -Mixes 30cm3 of...