The Diprotic Acid C_2H_2O_4 has an initial concentration of 080. Where K_a1 = C_

Question

The Diprotic Acid C_2H_2O_4 has an initial concentration of 080. Where K_a1 = C_2H2O_4^- H^- + C2HO_4^- = 6.5 times 10^K_a2 = C_2H_2O_4^- H^+ + C_2O_4^2- = 6.1 times 10^-5 What is [the concentration of C_2HO_4 What is the concentration ofC_2O_4^2- What is H ion concentration for the Ka_2. For an exothermic reaction, the energy of the products is lower or higher than the reactants The enthalpy sign for an endothermic reaction is What is the pH of a solution containing 0.30 M HCOOH and 0.52 M HCOOK? Which of the following couples are buffer systems? (a) KF/HF (b) KBr/HBr (c) Na_2CO_3/NaHCO_3 What is the pH of the 0.30 M NH_3/0.36 MNH_4 Cl buffer system. What is the pH after the addition of 20.0 mL of 0.050 M NaOH to 80.0 mL of the buffer solution? How would you prepare a liter of carbonate buffer at a pH of 10.10? you are provided with carbonic acid (H_2CO_3), sodium hydrogen carbonate (NaHCO_3), and sodium carbonate (Na_2CO_3). Lookup Ka values. 100 ml of 0.010M nitrous acid (HNO_2) are titrated with a 0.10 M NaOH solution. Calculate the pH for (a) the initial solution (b) after 80 mL has been added (c) the equivalence point (d) after 105 mL has been added

Explanation / Answer

14) Exothermic reactions are those in which heat is evolved.

Change in enthalpy = energy of products - energy of reactants

exothermic reaction = -ve

Therefore, energy of products is lower than reactants.

15) For endothermic reaction heat need to supplied

change in enthalpy is +ve

16) HOOH = 0.30 M

HCOOK = 0.52 M

concentration of H+ ion is = 0.30 + 0.52 = 0.82 M

PH = -log [H+]

= -log [0.82]

= 0.086

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