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6. What is an example of a tribasic acid?

  • H3PO4
  • HCl
  • H2S04

7. For strong acids, why does [H+] = [HA] ?

  • H+ and HA react together in equal quantities
  • because the acid dissociates completely
  • because the acid doesn

8. What is a buffer?

  • a mixture that minimises the changes in pH on addition of small amounts of base
  • a mixture that minimises the changes in pH on addition of small amounts of acid and alkali
  • a mixture that minimises the changes in pH on addition of small amounts of alkali
  • a mixture that minimises the changes in pH on addition of small amounts of acid

9. What is the end point?

  • point at which the concentrations of the weak acid and the conjugate base of an indicator are equal
  • when there is a higher concentration of weak acid than conjugage base in the indicator mixture
  • when there is a higher concentration of conjugate base than weak acid in the indicator mixture

10. what is the equation for Kc (where A and B are reactants, and C and D are products)

  • Kc = ( [A]^a x [B]^b )
  • Kc =( [A]^a x [B]^b ) / ( [C]^c x [D]^d )
  • Kc = ( [C]^c x [D]^d ) / ( [A]^a x [B]^b )
  • Kc = ( [C]^c x [D]^d )