Questions asked by JayJay

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• The #"pH"# at one-half the equivalence point in an acid-base titration was found to be #5.67#. What is the value of #K_a# for this unknown acid?
  
• Gibbs Free Energy. Why are equilibrium constants for a chemical reaction temperature dependent?
  
• Methanol. The change in standard free energy for the synthesis of liquid methanol from gaseous carbon monoxide and hydrogen is -29 kJ/mole of methanol. Write the balanced reaction equation, the equilibrium constant expression?
  
• A 25.0 ml sample of 0.150 M nitrous acid is titrated with a0.150 M NaOH solution. What is the pH at the equivalence point? theKa of Nitrous Acid is 4.50 x 10-4.
  
• Balance the redox reaction H+ (aq) + Cr (s) --> H2 (g) + Cr2+ ?