Utilizing Henderson-Hasselbach Equation, how to solve the given equation below? Determine and solve for the pKa of formic acid when the pH of a given buffer system containing an equimolar amounts of formic acid and formate has a pH of 2.50.

a) HCl solubility test One common organic functional group, the amine group, is found in compounds that are insoluble in water but soluble in aqueous HCl solution. Draw the structure of a compound with this functional group. Write the equation for the reaction of this compound with aqueous HCl solution. Explain why amines would be soluble in aqueous HCl even though they are insoluble in water. The compound should have 15 number of carbons.   b) Bromine test for alkenes Draw the structure for an alkene, then write the mechanism (using electron pushing arrows) and predict the product for the reaction between this alkene and Br2. Bromine is orange color, and bromoalkanes are colorless. Explain what the reactants and products would look like before and after this reaction occurs. The compound should have 15 number of carbons.

Consider the following reaction where K. = 7.00x105 at 673 K. NH,I(s) NH3(g) + HI(g) A reaction mixture was found to contain 5.18×102 moles of NH,I(s), 1.15×102 moles of NH3(g), and 8.37x103 moles of HI(g), in a 1.00 liter container. Is the reaction at equilibrium? If not, what direction must it run in order to reach equilibrium? The reaction quotient, Qc. equals The reaction A. must run in the forward direction to reach equilibrium. B. must run in the reverse direction to reach equilibrium. C. is at equilibrium.

Calculate the pH and fraction of dissociation (?) for each of the acetic acid (CH3COOH, p?a=4.756) solutions. A 2.15*10^-12 M solution of CH3COOHCH3COOH.