2) You are tasked with creating 0.500L of a buffer using the least amount of reagents. - It must have a pH of 4.30 - When 0.10 moles of sodium hydroxide, NaOH are added, the pH doesn't change by more than 0.5pH units. - You may choose from the following: Hydrocyanic acid = HCN, pKa =9.21 (with sodium cyanide, NaCN) Hydrazidic acid =HN3,pK3=4.72 (with sodium azide, NaN3 ) Formic Acid =HCHO2,pK3=3.74 (with sodium formate, NaCHO2 ) Hydrofluoric acid = HF, pKKa=3.20 (with sodium fluoride, NaF) A) Choose your buffer system, justify your selection Hydrozidic aeid b/C the pla is closest to the desined of B) Determine the ratio of [A]/[HA] to create the buffer system with a pH of 4.3 C) Write the reaction for the OH- reacting with your buffer system. D) Will the pH of your system increase or decrease with the addition of the NaOH? What is the limit for your pH? E) Calculate the molarity of the acid and base needed for this buffer. (This is challenge, see if you can do it. - this type of problem would not appear on the AP chemistry exam.)