Question

8ml of hydrochloric acid is added to 10ml of a 1M soda. After this addition, the measure of the molar concentration of H₃0⁺ ion gives 10^-7M. What is the concentration in mol/l of the acid solution?

Which of the following acids is the strongest?

A. HCN;pKa(HCN/CN₃^-)=9.2

B. HNO₂;pKa(HNO₂/NO₂)=3.3

C. H₃PO₄;pKa(H₃PO₄/H₂PO₄^-)=2.1

D. H₂CO₃;Ka(H₂CO₃/HCO₃^-)=4.5x10^-7

E. H₂SO₃;Ka(H₂SO₃/HSO₃^-)=1.7x10^-2

Answer 1

H3PO4;pKa(H3PO4/H2PO4-)=2.1