Question

Assume that you mix equal volumes of the two solutions listed. Select all of the following buffer solutions that have a greater buffering capacity to absorb strong acid than to absorb strong base.

0.10 M HF and 0.10 M NaF

0.10 M HNO₂ and 0.040 M KOH

0.20 M CH₃NH₂ and 0.08 M HCl

0.15 M HBr and 0.35 M NaF

0.20 M HClO and 0.30 M NaClO

0.050 M HCN and 0.020 magnesium hydroxide

0.10 M C₆H₅NH₂ and 0.03 M HCl

Answer 1

Conjugate acid and Conjugate basei Consider a reaction NH3+ HCNHCI Here HCl is acid and NH3 is base. HCl has given one proton Ht to NH3 and forming NH4. Since the product NH4can donate a proton back to C it is labled as conjugate acid while Cl as conjugate base Now consider the given examples 0.10 M HF and 0.10 M NaF no, it has equal conjugate base & conjugate acid 0.10 M HNO2 and 0.040 M KOH0.06M HNO2 & 0.04M KNO2 no, it has more conjugate acid 0.20 M CH3NH2 and 0.08 M HCI-0.12M base CH3NH2 & 0.08 M CH3NH3 C yes, it has more conjugate base CH3NH2 than conjugate acid CH3NH3* 0.15 M strong acid HBrand 0.35 M NaF->0.15M weak acid HF & 0.20M NaF es, it has more conugate baseNfthnconjugate acid HF 0.20 M HClo and 0.30 M NaClO yes, it has more conjugate base NaciQ than conjugate acid HCIO 0.050 M HCN d 0.020M Mg(OH)0.01 M HCN & 0.04 M CN as more conjgb-than conjugate acid HCN 0.10 M CsH,NH2 and 0.03 M HCl0.07M CsH,NH2 & 0.03 M C6HNH3 C yes, it has more conjugate base C6H5NH2 than conjugate acid CsH,NHs